Switch "UTC time" to "Unix epoch time"

This is more correct.

Bug: 218802673
Test: Compile only
Merged-In: Ic477c021529a94b4a3665426b7daaf6567fa311a
Change-Id: Ic477c021529a94b4a3665426b7daaf6567fa311a
diff --git a/core/java/android/app/time/ExternalTimeSuggestion.java b/core/java/android/app/time/ExternalTimeSuggestion.java
index 8e281c0..a7c0e5c 100644
--- a/core/java/android/app/time/ExternalTimeSuggestion.java
+++ b/core/java/android/app/time/ExternalTimeSuggestion.java
@@ -50,16 +50,17 @@
  * <p>The creator of an external suggestion is expected to be separate Android process, e.g. a
  * process integrating with the external time source via a HAL or local network. The creator must
  * capture the elapsed realtime reference clock, e.g. via {@link SystemClock#elapsedRealtime()},
- * when the UTC time is first obtained (usually under a wakelock). This enables Android to adjust
- * for latency introduced between suggestion creation and eventual use. Adjustments for other
+ * when the Unix epoch time is first obtained (usually under a wakelock). This enables Android to
+ * adjust for latency introduced between suggestion creation and eventual use. Adjustments for other
  * sources of latency, i.e. those before the external time suggestion is created, must be handled by
  * the creator.
  *
  * <p>{@code elapsedRealtimeMillis} and {@code suggestionMillis} represent the suggested time.
- * {@code suggestionMillis} is the number of milliseconds elapsed since 1/1/1970 00:00:00 UTC.
- * {@code elapsedRealtimeMillis} is the value of the elapsed realtime clock when {@code
- * suggestionMillis} was established. Note that the elapsed realtime clock is considered accurate
- * but it is volatile, so time suggestions cannot be persisted across device resets.
+ * {@code suggestionMillis} is the number of milliseconds elapsed since 1/1/1970 00:00:00 UTC
+ * according to the Unix time scale. {@code elapsedRealtimeMillis} is the value of the elapsed
+ * realtime clock when {@code suggestionMillis} was established. Note that the elapsed realtime
+ * clock is considered accurate but it is volatile, so time suggestions cannot be persisted across
+ * device resets.
  *
  * <p>{@code debugInfo} contains debugging metadata associated with the suggestion. This is used to
  * record why the suggestion exists and how it was entered. This information exists only to aid in
@@ -83,7 +84,7 @@
             };
 
     @NonNull
-    private final TimestampedValue<Long> mUtcTime;
+    private final TimestampedValue<Long> mUnixEpochTime;
     @Nullable
     private ArrayList<String> mDebugInfo;
 
@@ -92,12 +93,12 @@
      * ExternalTimeSuggestion} for more details.
      *
      * @param elapsedRealtimeMillis the elapsed realtime clock reference for the suggestion
-     * @param suggestionMillis      the suggested UTC time in milliseconds since the start of the
+     * @param suggestionMillis      the suggested time in milliseconds since the start of the
      *                              Unix epoch
      */
     public ExternalTimeSuggestion(@ElapsedRealtimeLong long elapsedRealtimeMillis,
             @CurrentTimeMillisLong long suggestionMillis) {
-        mUtcTime = new TimestampedValue(elapsedRealtimeMillis, suggestionMillis);
+        mUnixEpochTime = new TimestampedValue(elapsedRealtimeMillis, suggestionMillis);
     }
 
     private static ExternalTimeSuggestion createFromParcel(Parcel in) {
@@ -117,7 +118,7 @@
 
     @Override
     public void writeToParcel(@NonNull Parcel dest, int flags) {
-        dest.writeParcelable(mUtcTime, 0);
+        dest.writeParcelable(mUnixEpochTime, 0);
         dest.writeList(mDebugInfo);
     }
 
@@ -125,8 +126,8 @@
      * {@hide}
      */
     @NonNull
-    public TimestampedValue<Long> getUtcTime() {
-        return mUtcTime;
+    public TimestampedValue<Long> getUnixEpochTime() {
+        return mUnixEpochTime;
     }
 
     /**
@@ -160,17 +161,18 @@
             return false;
         }
         ExternalTimeSuggestion that = (ExternalTimeSuggestion) o;
-        return Objects.equals(mUtcTime, that.mUtcTime);
+        return Objects.equals(mUnixEpochTime, that.mUnixEpochTime);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(mUtcTime);
+        return Objects.hash(mUnixEpochTime);
     }
 
     @Override
     public String toString() {
-        return "ExternalTimeSuggestion{" + "mUtcTime=" + mUtcTime + ", mDebugInfo=" + mDebugInfo
+        return "ExternalTimeSuggestion{" + "mUnixEpochTime=" + mUnixEpochTime
+                + ", mDebugInfo=" + mDebugInfo
                 + '}';
     }
 }
diff --git a/core/java/android/app/timedetector/GnssTimeSuggestion.java b/core/java/android/app/timedetector/GnssTimeSuggestion.java
index 6478a2d..34f4565 100644
--- a/core/java/android/app/timedetector/GnssTimeSuggestion.java
+++ b/core/java/android/app/timedetector/GnssTimeSuggestion.java
@@ -31,11 +31,11 @@
 /**
  * A time signal from a GNSS source.
  *
- * <p>{@code utcTime} is the suggested time. The {@code utcTime.value} is the number of milliseconds
- * elapsed since 1/1/1970 00:00:00 UTC. The {@code utcTime.referenceTimeMillis} is the value of the
- * elapsed realtime clock when the {@code utcTime.value} was established.
- * Note that the elapsed realtime clock is considered accurate but it is volatile, so time
- * suggestions cannot be persisted across device resets.
+ * <p>{@code unixEpochTime} is the suggested time. The {@code unixEpochTime.value} is the number of
+ * milliseconds elapsed since 1/1/1970 00:00:00 UTC according to the Unix time system. The {@code
+ * unixEpochTime.referenceTimeMillis} is the value of the elapsed realtime clock when the {@code
+ * unixEpochTime.value} was established. Note that the elapsed realtime clock is considered accurate
+ * but it is volatile, so time suggestions cannot be persisted across device resets.
  *
  * <p>{@code debugInfo} contains debugging metadata associated with the suggestion. This is used to
  * record why the suggestion exists and how it was entered. This information exists only to aid in
@@ -57,17 +57,17 @@
                 }
             };
 
-    @NonNull private final TimestampedValue<Long> mUtcTime;
+    @NonNull private final TimestampedValue<Long> mUnixEpochTime;
     @Nullable private ArrayList<String> mDebugInfo;
 
-    public GnssTimeSuggestion(@NonNull TimestampedValue<Long> utcTime) {
-        mUtcTime = Objects.requireNonNull(utcTime);
-        Objects.requireNonNull(utcTime.getValue());
+    public GnssTimeSuggestion(@NonNull TimestampedValue<Long> unixEpochTime) {
+        mUnixEpochTime = Objects.requireNonNull(unixEpochTime);
+        Objects.requireNonNull(unixEpochTime.getValue());
     }
 
     private static GnssTimeSuggestion createFromParcel(Parcel in) {
-        TimestampedValue<Long> utcTime = in.readParcelable(null /* classLoader */);
-        GnssTimeSuggestion suggestion = new GnssTimeSuggestion(utcTime);
+        TimestampedValue<Long> unixEpochTime = in.readParcelable(null /* classLoader */);
+        GnssTimeSuggestion suggestion = new GnssTimeSuggestion(unixEpochTime);
         @SuppressWarnings("unchecked")
         ArrayList<String> debugInfo = (ArrayList<String>) in.readArrayList(null /* classLoader */);
         suggestion.mDebugInfo = debugInfo;
@@ -81,13 +81,13 @@
 
     @Override
     public void writeToParcel(@NonNull Parcel dest, int flags) {
-        dest.writeParcelable(mUtcTime, 0);
+        dest.writeParcelable(mUnixEpochTime, 0);
         dest.writeList(mDebugInfo);
     }
 
     @NonNull
-    public TimestampedValue<Long> getUtcTime() {
-        return mUtcTime;
+    public TimestampedValue<Long> getUnixEpochTime() {
+        return mUnixEpochTime;
     }
 
     @NonNull
@@ -117,18 +117,18 @@
             return false;
         }
         GnssTimeSuggestion that = (GnssTimeSuggestion) o;
-        return Objects.equals(mUtcTime, that.mUtcTime);
+        return Objects.equals(mUnixEpochTime, that.mUnixEpochTime);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(mUtcTime);
+        return Objects.hash(mUnixEpochTime);
     }
 
     @Override
     public String toString() {
         return "GnssTimeSuggestion{"
-                + "mUtcTime=" + mUtcTime
+                + "mUnixEpochTime=" + mUnixEpochTime
                 + ", mDebugInfo=" + mDebugInfo
                 + '}';
     }
diff --git a/core/java/android/app/timedetector/ManualTimeSuggestion.java b/core/java/android/app/timedetector/ManualTimeSuggestion.java
index 299e951..76db33b 100644
--- a/core/java/android/app/timedetector/ManualTimeSuggestion.java
+++ b/core/java/android/app/timedetector/ManualTimeSuggestion.java
@@ -31,9 +31,9 @@
 /**
  * A time signal from a manual (user provided) source.
  *
- * <p>{@code utcTime} is the suggested time. The {@code utcTime.value} is the number of milliseconds
- * elapsed since 1/1/1970 00:00:00 UTC. The {@code utcTime.referenceTimeMillis} is the value of the
- * elapsed realtime clock when the {@code utcTime.value} was established.
+ * <p>{@code unixEpochTime} is the suggested time. The {@code unixEpochTime.value} is the number of
+ * milliseconds elapsed since 1/1/1970 00:00:00 UTC. The {@code unixEpochTime.referenceTimeMillis}
+ * is the value of the elapsed realtime clock when the {@code unixEpochTime.value} was established.
  * Note that the elapsed realtime clock is considered accurate but it is volatile, so time
  * suggestions cannot be persisted across device resets.
  *
@@ -57,17 +57,17 @@
                 }
             };
 
-    @NonNull private final TimestampedValue<Long> mUtcTime;
+    @NonNull private final TimestampedValue<Long> mUnixEpochTime;
     @Nullable private ArrayList<String> mDebugInfo;
 
-    public ManualTimeSuggestion(@NonNull TimestampedValue<Long> utcTime) {
-        mUtcTime = Objects.requireNonNull(utcTime);
-        Objects.requireNonNull(utcTime.getValue());
+    public ManualTimeSuggestion(@NonNull TimestampedValue<Long> unixEpochTime) {
+        mUnixEpochTime = Objects.requireNonNull(unixEpochTime);
+        Objects.requireNonNull(unixEpochTime.getValue());
     }
 
     private static ManualTimeSuggestion createFromParcel(Parcel in) {
-        TimestampedValue<Long> utcTime = in.readParcelable(null /* classLoader */);
-        ManualTimeSuggestion suggestion = new ManualTimeSuggestion(utcTime);
+        TimestampedValue<Long> unixEpochTime = in.readParcelable(null /* classLoader */);
+        ManualTimeSuggestion suggestion = new ManualTimeSuggestion(unixEpochTime);
         @SuppressWarnings("unchecked")
         ArrayList<String> debugInfo = (ArrayList<String>) in.readArrayList(null /* classLoader */);
         suggestion.mDebugInfo = debugInfo;
@@ -81,13 +81,13 @@
 
     @Override
     public void writeToParcel(@NonNull Parcel dest, int flags) {
-        dest.writeParcelable(mUtcTime, 0);
+        dest.writeParcelable(mUnixEpochTime, 0);
         dest.writeList(mDebugInfo);
     }
 
     @NonNull
-    public TimestampedValue<Long> getUtcTime() {
-        return mUtcTime;
+    public TimestampedValue<Long> getUnixEpochTime() {
+        return mUnixEpochTime;
     }
 
     @NonNull
@@ -117,18 +117,18 @@
             return false;
         }
         ManualTimeSuggestion that = (ManualTimeSuggestion) o;
-        return Objects.equals(mUtcTime, that.mUtcTime);
+        return Objects.equals(mUnixEpochTime, that.mUnixEpochTime);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(mUtcTime);
+        return Objects.hash(mUnixEpochTime);
     }
 
     @Override
     public String toString() {
         return "ManualTimeSuggestion{"
-                + "mUtcTime=" + mUtcTime
+                + "mUnixEpochTime=" + mUnixEpochTime
                 + ", mDebugInfo=" + mDebugInfo
                 + '}';
     }
diff --git a/core/java/android/app/timedetector/NetworkTimeSuggestion.java b/core/java/android/app/timedetector/NetworkTimeSuggestion.java
index a5259c2..e22f1d6e 100644
--- a/core/java/android/app/timedetector/NetworkTimeSuggestion.java
+++ b/core/java/android/app/timedetector/NetworkTimeSuggestion.java
@@ -31,11 +31,12 @@
 /**
  * A time signal from a network time source like NTP.
  *
- * <p>{@code utcTime} contains the suggested time. The {@code utcTime.value} is the number of
- * milliseconds elapsed since 1/1/1970 00:00:00 UTC. The {@code utcTime.referenceTimeMillis} is the
- * value of the elapsed realtime clock when the {@code utcTime.value} was established.
- * Note that the elapsed realtime clock is considered accurate but it is volatile, so time
- * suggestions cannot be persisted across device resets.
+ * <p>{@code unixEpochTime} contains the suggested time. The {@code unixEpochTime.value} is the
+ * number of milliseconds elapsed since 1/1/1970 00:00:00 UTC according to the Unix time system.
+ * The {@code unixEpochTime.referenceTimeMillis} is the value of the elapsed realtime clock when
+ * the {@code unixEpochTime.value} was established. Note that the elapsed realtime clock is
+ * considered accurate but it is volatile, so time suggestions cannot be persisted across device
+ * resets.
  *
  * <p>{@code debugInfo} contains debugging metadata associated with the suggestion. This is used to
  * record why the suggestion exists and how it was determined. This information exists only to aid
@@ -57,17 +58,17 @@
                 }
             };
 
-    @NonNull private final TimestampedValue<Long> mUtcTime;
+    @NonNull private final TimestampedValue<Long> mUnixEpochTime;
     @Nullable private ArrayList<String> mDebugInfo;
 
-    public NetworkTimeSuggestion(@NonNull TimestampedValue<Long> utcTime) {
-        mUtcTime = Objects.requireNonNull(utcTime);
-        Objects.requireNonNull(utcTime.getValue());
+    public NetworkTimeSuggestion(@NonNull TimestampedValue<Long> unixEpochTime) {
+        mUnixEpochTime = Objects.requireNonNull(unixEpochTime);
+        Objects.requireNonNull(unixEpochTime.getValue());
     }
 
     private static NetworkTimeSuggestion createFromParcel(Parcel in) {
-        TimestampedValue<Long> utcTime = in.readParcelable(null /* classLoader */);
-        NetworkTimeSuggestion suggestion = new NetworkTimeSuggestion(utcTime);
+        TimestampedValue<Long> unixEpochTime = in.readParcelable(null /* classLoader */);
+        NetworkTimeSuggestion suggestion = new NetworkTimeSuggestion(unixEpochTime);
         @SuppressWarnings("unchecked")
         ArrayList<String> debugInfo = (ArrayList<String>) in.readArrayList(null /* classLoader */);
         suggestion.mDebugInfo = debugInfo;
@@ -81,13 +82,13 @@
 
     @Override
     public void writeToParcel(@NonNull Parcel dest, int flags) {
-        dest.writeParcelable(mUtcTime, 0);
+        dest.writeParcelable(mUnixEpochTime, 0);
         dest.writeList(mDebugInfo);
     }
 
     @NonNull
-    public TimestampedValue<Long> getUtcTime() {
-        return mUtcTime;
+    public TimestampedValue<Long> getUnixEpochTime() {
+        return mUnixEpochTime;
     }
 
     @NonNull
@@ -117,18 +118,18 @@
             return false;
         }
         NetworkTimeSuggestion that = (NetworkTimeSuggestion) o;
-        return Objects.equals(mUtcTime, that.mUtcTime);
+        return Objects.equals(mUnixEpochTime, that.mUnixEpochTime);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(mUtcTime);
+        return Objects.hash(mUnixEpochTime);
     }
 
     @Override
     public String toString() {
         return "NetworkTimeSuggestion{"
-                + "mUtcTime=" + mUtcTime
+                + "mUnixEpochTime=" + mUnixEpochTime
                 + ", mDebugInfo=" + mDebugInfo
                 + '}';
     }
diff --git a/core/java/android/app/timedetector/TelephonyTimeSuggestion.java b/core/java/android/app/timedetector/TelephonyTimeSuggestion.java
index 6c3a304..4ff7517 100644
--- a/core/java/android/app/timedetector/TelephonyTimeSuggestion.java
+++ b/core/java/android/app/timedetector/TelephonyTimeSuggestion.java
@@ -34,12 +34,12 @@
  * <p>{@code slotIndex} identifies the suggestion source. This enables detection logic to identify
  * suggestions from the same source when there are several in use.
  *
- * <p>{@code utcTime}. When not {@code null}, the {@code utcTime.value} is the number of
- * milliseconds elapsed since 1/1/1970 00:00:00 UTC. The {@code utcTime.referenceTimeMillis} is the
- * value of the elapsed realtime clock when the {@code utcTime.value} was established.
+ * <p>{@code unixEpochTime}. When not {@code null}, the {@code unixEpochTime.value} is the number of
+ * milliseconds elapsed since 1/1/1970 00:00:00 UTC. The {@code unixEpochTime.referenceTimeMillis}
+ * is the value of the elapsed realtime clock when the {@code unixEpochTime.value} was established.
  * Note that the elapsed realtime clock is considered accurate but it is volatile, so time
- * suggestions cannot be persisted across device resets. {@code utcTime} can be {@code null} to
- * indicate that the telephony source has entered an "un-opinionated" state and any previous
+ * suggestions cannot be persisted across device resets. {@code unixEpochTime} can be {@code null}
+ * to indicate that the telephony source has entered an "un-opinionated" state and any previous
  * suggestion from the source is being withdrawn.
  *
  * <p>{@code debugInfo} contains debugging metadata associated with the suggestion. This is used to
@@ -65,19 +65,20 @@
             };
 
     private final int mSlotIndex;
-    @Nullable private final TimestampedValue<Long> mUtcTime;
+    @Nullable private final TimestampedValue<Long> mUnixEpochTime;
     @Nullable private ArrayList<String> mDebugInfo;
 
     private TelephonyTimeSuggestion(Builder builder) {
         mSlotIndex = builder.mSlotIndex;
-        mUtcTime = builder.mUtcTime;
+        mUnixEpochTime = builder.mUnixEpochTime;
         mDebugInfo = builder.mDebugInfo != null ? new ArrayList<>(builder.mDebugInfo) : null;
     }
 
     private static TelephonyTimeSuggestion createFromParcel(Parcel in) {
         int slotIndex = in.readInt();
+        TimestampedValue<Long> unixEpochTime = in.readParcelable(null /* classLoader */);
         TelephonyTimeSuggestion suggestion = new TelephonyTimeSuggestion.Builder(slotIndex)
-                .setUtcTime(in.readParcelable(null /* classLoader */))
+                .setUnixEpochTime(unixEpochTime)
                 .build();
         @SuppressWarnings("unchecked")
         ArrayList<String> debugInfo = (ArrayList<String>) in.readArrayList(null /* classLoader */);
@@ -95,7 +96,7 @@
     @Override
     public void writeToParcel(@NonNull Parcel dest, int flags) {
         dest.writeInt(mSlotIndex);
-        dest.writeParcelable(mUtcTime, 0);
+        dest.writeParcelable(mUnixEpochTime, 0);
         dest.writeList(mDebugInfo);
     }
 
@@ -111,11 +112,11 @@
     /**
      * Returns the suggested time or {@code null} if there isn't one.
      *
-     * <p>See {@link TelephonyTimeSuggestion} for more information about {@code utcTime}.
+     * <p>See {@link TelephonyTimeSuggestion} for more information about {@code unixEpochTime}.
      */
     @Nullable
-    public TimestampedValue<Long> getUtcTime() {
-        return mUtcTime;
+    public TimestampedValue<Long> getUnixEpochTime() {
+        return mUnixEpochTime;
     }
 
     /**
@@ -163,19 +164,19 @@
         }
         TelephonyTimeSuggestion that = (TelephonyTimeSuggestion) o;
         return mSlotIndex == that.mSlotIndex
-                && Objects.equals(mUtcTime, that.mUtcTime);
+                && Objects.equals(mUnixEpochTime, that.mUnixEpochTime);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(mSlotIndex, mUtcTime);
+        return Objects.hash(mSlotIndex, mUnixEpochTime);
     }
 
     @Override
     public String toString() {
         return "TelephonyTimeSuggestion{"
                 + "mSlotIndex='" + mSlotIndex + '\''
-                + ", mUtcTime=" + mUtcTime
+                + ", mUnixEpochTime=" + mUnixEpochTime
                 + ", mDebugInfo=" + mDebugInfo
                 + '}';
     }
@@ -187,7 +188,7 @@
      */
     public static final class Builder {
         private final int mSlotIndex;
-        @Nullable private TimestampedValue<Long> mUtcTime;
+        @Nullable private TimestampedValue<Long> mUnixEpochTime;
         @Nullable private List<String> mDebugInfo;
 
         /**
@@ -202,16 +203,16 @@
         /**
          * Returns the builder for call chaining.
          *
-         * <p>See {@link TelephonyTimeSuggestion} for more information about {@code utcTime}.
+         * <p>See {@link TelephonyTimeSuggestion} for more information about {@code unixEpochTime}.
          */
         @NonNull
-        public Builder setUtcTime(@Nullable TimestampedValue<Long> utcTime) {
-            if (utcTime != null) {
-                // utcTime can be null, but the value it holds cannot.
-                Objects.requireNonNull(utcTime.getValue());
+        public Builder setUnixEpochTime(@Nullable TimestampedValue<Long> unixEpochTime) {
+            if (unixEpochTime != null) {
+                // unixEpochTime can be null, but the value it holds cannot.
+                Objects.requireNonNull(unixEpochTime.getValue());
             }
 
-            mUtcTime = utcTime;
+            mUnixEpochTime = unixEpochTime;
             return this;
         }
 
diff --git a/core/tests/coretests/src/android/app/timedetector/TelephonyTimeSuggestionTest.java b/core/tests/coretests/src/android/app/timedetector/TelephonyTimeSuggestionTest.java
index 4b64dfc..cc75579 100644
--- a/core/tests/coretests/src/android/app/timedetector/TelephonyTimeSuggestionTest.java
+++ b/core/tests/coretests/src/android/app/timedetector/TelephonyTimeSuggestionTest.java
@@ -45,13 +45,13 @@
             assertEquals(two, one);
         }
 
-        builder1.setUtcTime(new TimestampedValue<>(1111L, 2222L));
+        builder1.setUnixEpochTime(new TimestampedValue<>(1111L, 2222L));
         {
             TelephonyTimeSuggestion one = builder1.build();
             assertEquals(one, one);
         }
 
-        builder2.setUtcTime(new TimestampedValue<>(1111L, 2222L));
+        builder2.setUnixEpochTime(new TimestampedValue<>(1111L, 2222L));
         {
             TelephonyTimeSuggestion one = builder1.build();
             TelephonyTimeSuggestion two = builder2.build();
@@ -61,7 +61,7 @@
 
         TelephonyTimeSuggestion.Builder builder3 =
                 new TelephonyTimeSuggestion.Builder(SLOT_INDEX + 1);
-        builder3.setUtcTime(new TimestampedValue<>(1111L, 2222L));
+        builder3.setUnixEpochTime(new TimestampedValue<>(1111L, 2222L));
         {
             TelephonyTimeSuggestion one = builder1.build();
             TelephonyTimeSuggestion three = builder3.build();
@@ -84,7 +84,7 @@
         TelephonyTimeSuggestion.Builder builder = new TelephonyTimeSuggestion.Builder(SLOT_INDEX);
         assertRoundTripParcelable(builder.build());
 
-        builder.setUtcTime(new TimestampedValue<>(1111L, 2222L));
+        builder.setUnixEpochTime(new TimestampedValue<>(1111L, 2222L));
         assertRoundTripParcelable(builder.build());
 
         // DebugInfo should also be stored (but is not checked by equals()
diff --git a/services/core/java/com/android/server/timedetector/TimeDetectorStrategyImpl.java b/services/core/java/com/android/server/timedetector/TimeDetectorStrategyImpl.java
index 357c232..ae4d46c 100644
--- a/services/core/java/com/android/server/timedetector/TimeDetectorStrategyImpl.java
+++ b/services/core/java/com/android/server/timedetector/TimeDetectorStrategyImpl.java
@@ -69,7 +69,7 @@
      * Telephony and network suggestions older than this value are considered too old to be used.
      */
     @VisibleForTesting
-    static final long MAX_UTC_TIME_AGE_MILLIS =
+    static final long MAX_SUGGESTION_TIME_AGE_MILLIS =
             TELEPHONY_BUCKET_COUNT * TELEPHONY_BUCKET_SIZE_MILLIS;
 
     /**
@@ -204,9 +204,9 @@
 
     @Override
     public synchronized void suggestExternalTime(@NonNull ExternalTimeSuggestion timeSuggestion) {
-        final TimestampedValue<Long> newUtcTime = timeSuggestion.getUtcTime();
+        final TimestampedValue<Long> newUnixEpochTime = timeSuggestion.getUnixEpochTime();
 
-        if (!validateAutoSuggestionTime(newUtcTime, timeSuggestion)) {
+        if (!validateAutoSuggestionTime(newUnixEpochTime, timeSuggestion)) {
             return;
         }
 
@@ -218,9 +218,9 @@
 
     @Override
     public synchronized void suggestGnssTime(@NonNull GnssTimeSuggestion timeSuggestion) {
-        final TimestampedValue<Long> newUtcTime = timeSuggestion.getUtcTime();
+        final TimestampedValue<Long> newUnixEpochTime = timeSuggestion.getUnixEpochTime();
 
-        if (!validateAutoSuggestionTime(newUtcTime, timeSuggestion)) {
+        if (!validateAutoSuggestionTime(newUnixEpochTime, timeSuggestion)) {
             return;
         }
 
@@ -232,19 +232,19 @@
 
     @Override
     public synchronized boolean suggestManualTime(@NonNull ManualTimeSuggestion suggestion) {
-        final TimestampedValue<Long> newUtcTime = suggestion.getUtcTime();
+        final TimestampedValue<Long> newUnixEpochTime = suggestion.getUnixEpochTime();
 
-        if (!validateSuggestionTime(newUtcTime, suggestion)) {
+        if (!validateSuggestionTime(newUnixEpochTime, suggestion)) {
             return false;
         }
 
         String cause = "Manual time suggestion received: suggestion=" + suggestion;
-        return setSystemClockIfRequired(ORIGIN_MANUAL, newUtcTime, cause);
+        return setSystemClockIfRequired(ORIGIN_MANUAL, newUnixEpochTime, cause);
     }
 
     @Override
     public synchronized void suggestNetworkTime(@NonNull NetworkTimeSuggestion timeSuggestion) {
-        if (!validateAutoSuggestionTime(timeSuggestion.getUtcTime(), timeSuggestion)) {
+        if (!validateAutoSuggestionTime(timeSuggestion.getUnixEpochTime(), timeSuggestion)) {
             return;
         }
 
@@ -274,11 +274,11 @@
         // unlike time zone, where a user may lose connectivity when boarding a flight and where we
         // do want to "forget" old signals. Suggestions that are too old are discarded later in the
         // detection algorithm.
-        if (timeSuggestion.getUtcTime() == null) {
+        if (timeSuggestion.getUnixEpochTime() == null) {
             return;
         }
 
-        if (!validateAutoSuggestionTime(timeSuggestion.getUtcTime(), timeSuggestion)) {
+        if (!validateAutoSuggestionTime(timeSuggestion.getUnixEpochTime(), timeSuggestion)) {
             return;
         }
 
@@ -365,14 +365,14 @@
     @GuardedBy("this")
     private boolean storeTelephonySuggestion(
             @NonNull TelephonyTimeSuggestion suggestion) {
-        TimestampedValue<Long> newUtcTime = suggestion.getUtcTime();
+        TimestampedValue<Long> newUnixEpochTime = suggestion.getUnixEpochTime();
 
         int slotIndex = suggestion.getSlotIndex();
         TelephonyTimeSuggestion previousSuggestion = mSuggestionBySlotIndex.get(slotIndex);
         if (previousSuggestion != null) {
             // We can log / discard suggestions with obvious issues with the reference time clock.
-            if (previousSuggestion.getUtcTime() == null
-                    || previousSuggestion.getUtcTime().getValue() == null) {
+            if (previousSuggestion.getUnixEpochTime() == null
+                    || previousSuggestion.getUnixEpochTime().getValue() == null) {
                 // This should be impossible given we only store validated suggestions.
                 Slog.w(LOG_TAG, "Previous suggestion is null or has a null time."
                         + " previousSuggestion=" + previousSuggestion
@@ -381,7 +381,7 @@
             }
 
             long referenceTimeDifference = TimestampedValue.referenceTimeDifference(
-                    newUtcTime, previousSuggestion.getUtcTime());
+                    newUnixEpochTime, previousSuggestion.getUnixEpochTime());
             if (referenceTimeDifference < 0) {
                 // The reference time is before the previously received suggestion. Ignore it.
                 Slog.w(LOG_TAG, "Out of order telephony suggestion received."
@@ -398,15 +398,15 @@
     }
 
     private boolean validateSuggestionTime(
-            @NonNull TimestampedValue<Long> newUtcTime, @NonNull Object suggestion) {
-        if (newUtcTime.getValue() == null) {
+            @NonNull TimestampedValue<Long> newUnixEpochTime, @NonNull Object suggestion) {
+        if (newUnixEpochTime.getValue() == null) {
             Slog.w(LOG_TAG, "Suggested time value is null. suggestion=" + suggestion);
             return false;
         }
 
         // We can validate the suggestion against the reference time clock.
         long elapsedRealtimeMillis = mEnvironment.elapsedRealtimeMillis();
-        if (elapsedRealtimeMillis < newUtcTime.getReferenceTimeMillis()) {
+        if (elapsedRealtimeMillis < newUnixEpochTime.getReferenceTimeMillis()) {
             // elapsedRealtime clock went backwards?
             Slog.w(LOG_TAG, "New reference time is in the future? Ignoring."
                     + " elapsedRealtimeMillis=" + elapsedRealtimeMillis
@@ -417,17 +417,17 @@
     }
 
     private boolean validateAutoSuggestionTime(
-            @NonNull TimestampedValue<Long> newUtcTime, @NonNull Object suggestion)  {
-        return validateSuggestionTime(newUtcTime, suggestion)
-                && validateSuggestionAgainstLowerBound(newUtcTime, suggestion);
+            @NonNull TimestampedValue<Long> newUnixEpochTime, @NonNull Object suggestion)  {
+        return validateSuggestionTime(newUnixEpochTime, suggestion)
+                && validateSuggestionAgainstLowerBound(newUnixEpochTime, suggestion);
     }
 
     private boolean validateSuggestionAgainstLowerBound(
-            @NonNull TimestampedValue<Long> newUtcTime, @NonNull Object suggestion) {
+            @NonNull TimestampedValue<Long> newUnixEpochTime, @NonNull Object suggestion) {
         Instant lowerBound = mEnvironment.autoTimeLowerBound();
 
         // Suggestion is definitely wrong if it comes before lower time bound.
-        if (lowerBound.isAfter(Instant.ofEpochMilli(newUtcTime.getValue()))) {
+        if (lowerBound.isAfter(Instant.ofEpochMilli(newUnixEpochTime.getValue()))) {
             Slog.w(LOG_TAG, "Suggestion points to time before lower bound, skipping it. "
                     + "suggestion=" + suggestion + ", lower bound=" + lowerBound);
             return false;
@@ -446,12 +446,12 @@
         // Try the different origins one at a time.
         int[] originPriorities = mEnvironment.autoOriginPriorities();
         for (int origin : originPriorities) {
-            TimestampedValue<Long> newUtcTime = null;
+            TimestampedValue<Long> newUnixEpochTime = null;
             String cause = null;
             if (origin == ORIGIN_TELEPHONY) {
                 TelephonyTimeSuggestion bestTelephonySuggestion = findBestTelephonySuggestion();
                 if (bestTelephonySuggestion != null) {
-                    newUtcTime = bestTelephonySuggestion.getUtcTime();
+                    newUnixEpochTime = bestTelephonySuggestion.getUnixEpochTime();
                     cause = "Found good telephony suggestion."
                             + ", bestTelephonySuggestion=" + bestTelephonySuggestion
                             + ", detectionReason=" + detectionReason;
@@ -459,7 +459,7 @@
             } else if (origin == ORIGIN_NETWORK) {
                 NetworkTimeSuggestion networkSuggestion = findLatestValidNetworkSuggestion();
                 if (networkSuggestion != null) {
-                    newUtcTime = networkSuggestion.getUtcTime();
+                    newUnixEpochTime = networkSuggestion.getUnixEpochTime();
                     cause = "Found good network suggestion."
                             + ", networkSuggestion=" + networkSuggestion
                             + ", detectionReason=" + detectionReason;
@@ -467,7 +467,7 @@
             } else if (origin == ORIGIN_GNSS) {
                 GnssTimeSuggestion gnssTimeSuggestion = findLatestValidGnssSuggestion();
                 if (gnssTimeSuggestion != null) {
-                    newUtcTime = gnssTimeSuggestion.getUtcTime();
+                    newUnixEpochTime = gnssTimeSuggestion.getUnixEpochTime();
                     cause = "Found good gnss suggestion."
                             + ", gnssTimeSuggestion=" + gnssTimeSuggestion
                             + ", detectionReason=" + detectionReason;
@@ -475,7 +475,7 @@
             } else if (origin == ORIGIN_EXTERNAL) {
                 ExternalTimeSuggestion externalTimeSuggestion = findLatestValidExternalSuggestion();
                 if (externalTimeSuggestion != null) {
-                    newUtcTime = externalTimeSuggestion.getUtcTime();
+                    newUnixEpochTime = externalTimeSuggestion.getUnixEpochTime();
                     cause = "Found good external suggestion."
                             + ", externalTimeSuggestion=" + externalTimeSuggestion
                             + ", detectionReason=" + detectionReason;
@@ -487,8 +487,8 @@
             }
 
             // Update the system clock if a good suggestion has been found.
-            if (newUtcTime != null) {
-                setSystemClockIfRequired(origin, newUtcTime, cause);
+            if (newUnixEpochTime != null) {
+                setSystemClockIfRequired(origin, newUnixEpochTime, cause);
                 return;
             }
         }
@@ -545,7 +545,7 @@
                 Slog.w(LOG_TAG, "Latest suggestion unexpectedly null for slotIndex."
                         + " slotIndex=" + slotIndex);
                 continue;
-            } else if (candidateSuggestion.getUtcTime() == null) {
+            } else if (candidateSuggestion.getUnixEpochTime() == null) {
                 // Unexpected - we do not store empty suggestions.
                 Slog.w(LOG_TAG, "Latest suggestion unexpectedly empty. "
                         + " candidateSuggestion=" + candidateSuggestion);
@@ -579,8 +579,8 @@
             long elapsedRealtimeMillis, @NonNull TelephonyTimeSuggestion timeSuggestion) {
 
         // Validate first.
-        TimestampedValue<Long> utcTime = timeSuggestion.getUtcTime();
-        if (!validateSuggestionUtcTime(elapsedRealtimeMillis, utcTime)) {
+        TimestampedValue<Long> unixEpochTime = timeSuggestion.getUnixEpochTime();
+        if (!validateSuggestionUnixEpochTime(elapsedRealtimeMillis, unixEpochTime)) {
             Slog.w(LOG_TAG, "Existing suggestion found to be invalid"
                     + " elapsedRealtimeMillis=" + elapsedRealtimeMillis
                     + ", timeSuggestion=" + timeSuggestion);
@@ -589,7 +589,7 @@
 
         // The score is based on the age since receipt. Suggestions are bucketed so two
         // suggestions in the same bucket from different slotIndexs are scored the same.
-        long ageMillis = elapsedRealtimeMillis - utcTime.getReferenceTimeMillis();
+        long ageMillis = elapsedRealtimeMillis - unixEpochTime.getReferenceTimeMillis();
 
         // Turn the age into a discrete value: 0 <= bucketIndex < TELEPHONY_BUCKET_COUNT.
         int bucketIndex = (int) (ageMillis / TELEPHONY_BUCKET_SIZE_MILLIS);
@@ -611,9 +611,9 @@
             return null;
         }
 
-        TimestampedValue<Long> utcTime = networkSuggestion.getUtcTime();
+        TimestampedValue<Long> unixEpochTime = networkSuggestion.getUnixEpochTime();
         long elapsedRealTimeMillis = mEnvironment.elapsedRealtimeMillis();
-        if (!validateSuggestionUtcTime(elapsedRealTimeMillis, utcTime)) {
+        if (!validateSuggestionUnixEpochTime(elapsedRealTimeMillis, unixEpochTime)) {
             // The latest suggestion is not valid, usually due to its age.
             return null;
         }
@@ -631,9 +631,9 @@
             return null;
         }
 
-        TimestampedValue<Long> utcTime = gnssTimeSuggestion.getUtcTime();
+        TimestampedValue<Long> unixEpochTime = gnssTimeSuggestion.getUnixEpochTime();
         long elapsedRealTimeMillis = mEnvironment.elapsedRealtimeMillis();
-        if (!validateSuggestionUtcTime(elapsedRealTimeMillis, utcTime)) {
+        if (!validateSuggestionUnixEpochTime(elapsedRealTimeMillis, unixEpochTime)) {
             // The latest suggestion is not valid, usually due to its age.
             return null;
         }
@@ -651,9 +651,9 @@
             return null;
         }
 
-        TimestampedValue<Long> utcTime = externalTimeSuggestion.getUtcTime();
+        TimestampedValue<Long> unixEpochTime = externalTimeSuggestion.getUnixEpochTime();
         long elapsedRealTimeMillis = mEnvironment.elapsedRealtimeMillis();
-        if (!validateSuggestionUtcTime(elapsedRealTimeMillis, utcTime)) {
+        if (!validateSuggestionUnixEpochTime(elapsedRealTimeMillis, unixEpochTime)) {
             // The latest suggestion is not valid, usually due to its age.
             return null;
         }
@@ -844,9 +844,9 @@
         return mLastExternalSuggestion.get();
     }
 
-    private static boolean validateSuggestionUtcTime(
-            long elapsedRealtimeMillis, TimestampedValue<Long> utcTime) {
-        long referenceTimeMillis = utcTime.getReferenceTimeMillis();
+    private static boolean validateSuggestionUnixEpochTime(
+            long elapsedRealtimeMillis, TimestampedValue<Long> unixEpochTime) {
+        long referenceTimeMillis = unixEpochTime.getReferenceTimeMillis();
         if (referenceTimeMillis > elapsedRealtimeMillis) {
             // Future reference times are ignored. They imply the reference time was wrong, or the
             // elapsed realtime clock used to derive it has gone backwards, neither of which are
@@ -860,6 +860,6 @@
         // made and never replaced, it could also mean that the time detection code remains
         // opinionated using a bad invalid suggestion. This caps that edge case at MAX_AGE_MILLIS.
         long ageMillis = elapsedRealtimeMillis - referenceTimeMillis;
-        return ageMillis <= MAX_UTC_TIME_AGE_MILLIS;
+        return ageMillis <= MAX_SUGGESTION_TIME_AGE_MILLIS;
     }
 }
diff --git a/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorServiceTest.java b/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorServiceTest.java
index 32fed3b..4519890 100644
--- a/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorServiceTest.java
+++ b/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorServiceTest.java
@@ -252,7 +252,7 @@
         int slotIndex = 1234;
         TimestampedValue<Long> timeValue = new TimestampedValue<>(100L, 1_000_000L);
         return new TelephonyTimeSuggestion.Builder(slotIndex)
-                .setUtcTime(timeValue)
+                .setUnixEpochTime(timeValue)
                 .build();
     }
 
diff --git a/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorStrategyImplTest.java b/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorStrategyImplTest.java
index 0d5b5a5..2d9903f 100644
--- a/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorStrategyImplTest.java
+++ b/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorStrategyImplTest.java
@@ -52,12 +52,12 @@
 @RunWith(AndroidJUnit4.class)
 public class TimeDetectorStrategyImplTest {
 
-    private static final Instant TIME_LOWER_BOUND = createUtcTime(2009, 1, 1, 12, 0, 0);
+    private static final Instant TIME_LOWER_BOUND = createUnixEpochTime(2009, 1, 1, 12, 0, 0);
 
     private static final TimestampedValue<Instant> ARBITRARY_CLOCK_INITIALIZATION_INFO =
             new TimestampedValue<>(
                     123456789L /* realtimeClockMillis */,
-                    createUtcTime(2010, 5, 23, 12, 0, 0));
+                    createUnixEpochTime(2010, 5, 23, 12, 0, 0));
 
     // This is the traditional ordering for time detection on Android.
     private static final @Origin int [] PROVIDERS_PRIORITY = { ORIGIN_TELEPHONY, ORIGIN_NETWORK };
@@ -66,7 +66,7 @@
      * An arbitrary time, very different from the {@link #ARBITRARY_CLOCK_INITIALIZATION_INFO}
      * time. Can be used as the basis for time suggestions.
      */
-    private static final Instant ARBITRARY_TEST_TIME = createUtcTime(2018, 1, 1, 12, 0, 0);
+    private static final Instant ARBITRARY_TEST_TIME = createUnixEpochTime(2018, 1, 1, 12, 0, 0);
 
     private static final int ARBITRARY_SLOT_INDEX = 123456;
 
@@ -91,7 +91,7 @@
                 .simulateTelephonyTimeSuggestion(timeSuggestion);
 
         long expectedSystemClockMillis =
-                mScript.calculateTimeInMillisForNow(timeSuggestion.getUtcTime());
+                mScript.calculateTimeInMillisForNow(timeSuggestion.getUnixEpochTime());
         mScript.verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis)
                 .assertLatestTelephonySuggestion(slotIndex, timeSuggestion);
     }
@@ -128,7 +128,7 @@
             mScript.simulateTimePassing(clockIncrementMillis);
 
             long expectedSystemClockMillis1 =
-                    mScript.calculateTimeInMillisForNow(timeSuggestion1.getUtcTime());
+                    mScript.calculateTimeInMillisForNow(timeSuggestion1.getUnixEpochTime());
 
             mScript.simulateTelephonyTimeSuggestion(timeSuggestion1)
                     .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis1)
@@ -155,7 +155,7 @@
             mScript.simulateTimePassing(clockIncrementMillis);
 
             long expectedSystemClockMillis3 =
-                    mScript.calculateTimeInMillisForNow(timeSuggestion3.getUtcTime());
+                    mScript.calculateTimeInMillisForNow(timeSuggestion3.getUnixEpochTime());
 
             mScript.simulateTelephonyTimeSuggestion(timeSuggestion3)
                     .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis3)
@@ -182,8 +182,8 @@
                     mScript.generateTelephonyTimeSuggestion(slotIndex2, slotIndex2Time);
             mScript.simulateTimePassing();
 
-            long expectedSystemClockMillis =
-                    mScript.calculateTimeInMillisForNow(slotIndex2TimeSuggestion.getUtcTime());
+            long expectedSystemClockMillis = mScript.calculateTimeInMillisForNow(
+                    slotIndex2TimeSuggestion.getUnixEpochTime());
 
             mScript.simulateTelephonyTimeSuggestion(slotIndex2TimeSuggestion)
                     .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis)
@@ -199,8 +199,8 @@
                     mScript.generateTelephonyTimeSuggestion(slotIndex1, slotIndex1Time);
             mScript.simulateTimePassing();
 
-            long expectedSystemClockMillis =
-                    mScript.calculateTimeInMillisForNow(slotIndex1TimeSuggestion.getUtcTime());
+            long expectedSystemClockMillis = mScript.calculateTimeInMillisForNow(
+                    slotIndex1TimeSuggestion.getUnixEpochTime());
 
             mScript.simulateTelephonyTimeSuggestion(slotIndex1TimeSuggestion)
                     .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis)
@@ -232,8 +232,8 @@
                     mScript.generateTelephonyTimeSuggestion(slotIndex2, slotIndex2Time);
             mScript.simulateTimePassing();
 
-            long expectedSystemClockMillis =
-                    mScript.calculateTimeInMillisForNow(slotIndex2TimeSuggestion.getUtcTime());
+            long expectedSystemClockMillis = mScript.calculateTimeInMillisForNow(
+                    slotIndex2TimeSuggestion.getUnixEpochTime());
 
             mScript.simulateTelephonyTimeSuggestion(slotIndex2TimeSuggestion)
                     .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis)
@@ -267,26 +267,27 @@
 
         TelephonyTimeSuggestion timeSuggestion1 =
                 mScript.generateTelephonyTimeSuggestion(slotIndex, testTime);
-        TimestampedValue<Long> utcTime1 = timeSuggestion1.getUtcTime();
+        TimestampedValue<Long> unixEpochTime1 = timeSuggestion1.getUnixEpochTime();
 
         // Initialize the strategy / device with a time set from a telephony suggestion.
         mScript.simulateTimePassing();
-        long expectedSystemClockMillis1 = mScript.calculateTimeInMillisForNow(utcTime1);
+        long expectedSystemClockMillis1 = mScript.calculateTimeInMillisForNow(unixEpochTime1);
         mScript.simulateTelephonyTimeSuggestion(timeSuggestion1)
                 .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis1)
                 .assertLatestTelephonySuggestion(slotIndex, timeSuggestion1);
 
-        // The UTC time increment should be larger than the system clock update threshold so we
-        // know it shouldn't be ignored for other reasons.
-        long validUtcTimeMillis = utcTime1.getValue() + (2 * systemClockUpdateThreshold);
+        // The Unix epoch time increment should be larger than the system clock update threshold so
+        // we know it shouldn't be ignored for other reasons.
+        long validUnixEpochTimeMillis = unixEpochTime1.getValue()
+                + (2 * systemClockUpdateThreshold);
 
         // Now supply a new signal that has an obviously bogus reference time : older than the last
         // one.
-        long referenceTimeBeforeLastSignalMillis = utcTime1.getReferenceTimeMillis() - 1;
-        TimestampedValue<Long> utcTime2 = new TimestampedValue<>(
-                referenceTimeBeforeLastSignalMillis, validUtcTimeMillis);
+        long referenceTimeBeforeLastSignalMillis = unixEpochTime1.getReferenceTimeMillis() - 1;
+        TimestampedValue<Long> unixEpochTime2 = new TimestampedValue<>(
+                referenceTimeBeforeLastSignalMillis, validUnixEpochTimeMillis);
         TelephonyTimeSuggestion timeSuggestion2 =
-                createTelephonyTimeSuggestion(slotIndex, utcTime2);
+                createTelephonyTimeSuggestion(slotIndex, unixEpochTime2);
         mScript.simulateTelephonyTimeSuggestion(timeSuggestion2)
                 .verifySystemClockWasNotSetAndResetCallTracking()
                 .assertLatestTelephonySuggestion(slotIndex, timeSuggestion1);
@@ -294,22 +295,22 @@
         // Now supply a new signal that has an obviously bogus reference time : substantially in the
         // future.
         long referenceTimeInFutureMillis =
-                utcTime1.getReferenceTimeMillis() + Integer.MAX_VALUE + 1;
-        TimestampedValue<Long> utcTime3 = new TimestampedValue<>(
-                referenceTimeInFutureMillis, validUtcTimeMillis);
+                unixEpochTime1.getReferenceTimeMillis() + Integer.MAX_VALUE + 1;
+        TimestampedValue<Long> unixEpochTime3 = new TimestampedValue<>(
+                referenceTimeInFutureMillis, validUnixEpochTimeMillis);
         TelephonyTimeSuggestion timeSuggestion3 =
-                createTelephonyTimeSuggestion(slotIndex, utcTime3);
+                createTelephonyTimeSuggestion(slotIndex, unixEpochTime3);
         mScript.simulateTelephonyTimeSuggestion(timeSuggestion3)
                 .verifySystemClockWasNotSetAndResetCallTracking()
                 .assertLatestTelephonySuggestion(slotIndex, timeSuggestion1);
 
-        // Just to prove validUtcTimeMillis is valid.
-        long validReferenceTimeMillis = utcTime1.getReferenceTimeMillis() + 100;
-        TimestampedValue<Long> utcTime4 = new TimestampedValue<>(
-                validReferenceTimeMillis, validUtcTimeMillis);
-        long expectedSystemClockMillis4 = mScript.calculateTimeInMillisForNow(utcTime4);
+        // Just to prove validUnixEpochTimeMillis is valid.
+        long validReferenceTimeMillis = unixEpochTime1.getReferenceTimeMillis() + 100;
+        TimestampedValue<Long> unixEpochTime4 = new TimestampedValue<>(
+                validReferenceTimeMillis, validUnixEpochTimeMillis);
+        long expectedSystemClockMillis4 = mScript.calculateTimeInMillisForNow(unixEpochTime4);
         TelephonyTimeSuggestion timeSuggestion4 =
-                createTelephonyTimeSuggestion(slotIndex, utcTime4);
+                createTelephonyTimeSuggestion(slotIndex, unixEpochTime4);
         mScript.simulateTelephonyTimeSuggestion(timeSuggestion4)
                 .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis4)
                 .assertLatestTelephonySuggestion(slotIndex, timeSuggestion4);
@@ -344,7 +345,7 @@
         Instant testTime = ARBITRARY_TEST_TIME;
         TelephonyTimeSuggestion timeSuggestion1 =
                 mScript.generateTelephonyTimeSuggestion(slotIndex, testTime);
-        TimestampedValue<Long> utcTime1 = timeSuggestion1.getUtcTime();
+        TimestampedValue<Long> unixEpochTime1 = timeSuggestion1.getUnixEpochTime();
 
         // Simulate time passing.
         mScript.simulateTimePassing(clockIncrementMillis);
@@ -358,7 +359,7 @@
         // Simulate more time passing.
         mScript.simulateTimePassing(clockIncrementMillis);
 
-        long expectedSystemClockMillis1 = mScript.calculateTimeInMillisForNow(utcTime1);
+        long expectedSystemClockMillis1 = mScript.calculateTimeInMillisForNow(unixEpochTime1);
 
         // Turn on auto time detection.
         mScript.simulateAutoTimeDetectionToggle()
@@ -379,7 +380,7 @@
         mScript.simulateTimePassing(clockIncrementMillis);
 
         long expectedSystemClockMillis2 =
-                mScript.calculateTimeInMillisForNow(timeSuggestion2.getUtcTime());
+                mScript.calculateTimeInMillisForNow(timeSuggestion2.getUnixEpochTime());
 
         // The new time, though valid, should not be set in the system clock because auto time is
         // disabled.
@@ -406,7 +407,7 @@
         mScript.simulateTimePassing();
 
         long expectedSystemClockMillis =
-                mScript.calculateTimeInMillisForNow(telephonySuggestion.getUtcTime());
+                mScript.calculateTimeInMillisForNow(telephonySuggestion.getUnixEpochTime());
         mScript.simulateTelephonyTimeSuggestion(telephonySuggestion)
                 .verifySystemClockWasSetAndResetCallTracking(
                         expectedSystemClockMillis  /* expectedNetworkBroadcast */)
@@ -416,7 +417,7 @@
         assertEquals(telephonySuggestion, mScript.peekBestTelephonySuggestion());
 
         // Simulate time passing, long enough that telephonySuggestion is now too old.
-        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_UTC_TIME_AGE_MILLIS);
+        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_SUGGESTION_TIME_AGE_MILLIS);
 
         // Look inside and check what the strategy considers the current best telephony suggestion.
         // It should still be the, it's just no longer used.
@@ -435,7 +436,7 @@
         mScript.simulateTimePassing();
 
         long expectedSystemClockMillis =
-                mScript.calculateTimeInMillisForNow(timeSuggestion.getUtcTime());
+                mScript.calculateTimeInMillisForNow(timeSuggestion.getUnixEpochTime());
         mScript.simulateManualTimeSuggestion(timeSuggestion, true /* expectedResult */)
                 .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis);
     }
@@ -457,7 +458,7 @@
         mScript.simulateTimePassing();
 
         long expectedAutoClockMillis =
-                mScript.calculateTimeInMillisForNow(telephonyTimeSuggestion.getUtcTime());
+                mScript.calculateTimeInMillisForNow(telephonyTimeSuggestion.getUnixEpochTime());
         mScript.simulateTelephonyTimeSuggestion(telephonyTimeSuggestion)
                 .verifySystemClockWasSetAndResetCallTracking(expectedAutoClockMillis)
                 .assertLatestTelephonySuggestion(slotIndex, telephonyTimeSuggestion);
@@ -480,7 +481,7 @@
         mScript.simulateTimePassing();
 
         long expectedManualClockMillis =
-                mScript.calculateTimeInMillisForNow(manualTimeSuggestion.getUtcTime());
+                mScript.calculateTimeInMillisForNow(manualTimeSuggestion.getUnixEpochTime());
         mScript.simulateManualTimeSuggestion(manualTimeSuggestion, true /* expectedResult */)
                 .verifySystemClockWasSetAndResetCallTracking(expectedManualClockMillis)
                 .assertLatestTelephonySuggestion(slotIndex, telephonyTimeSuggestion);
@@ -492,7 +493,7 @@
         mScript.simulateAutoTimeDetectionToggle();
 
         expectedAutoClockMillis =
-                mScript.calculateTimeInMillisForNow(telephonyTimeSuggestion.getUtcTime());
+                mScript.calculateTimeInMillisForNow(telephonyTimeSuggestion.getUnixEpochTime());
         mScript.verifySystemClockWasSetAndResetCallTracking(expectedAutoClockMillis)
                 .assertLatestTelephonySuggestion(slotIndex, telephonyTimeSuggestion);
 
@@ -540,7 +541,7 @@
         mScript.simulateTimePassing();
 
         long expectedSystemClockMillis =
-                mScript.calculateTimeInMillisForNow(timeSuggestion.getUtcTime());
+                mScript.calculateTimeInMillisForNow(timeSuggestion.getUnixEpochTime());
         mScript.simulateNetworkTimeSuggestion(timeSuggestion)
                 .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis);
     }
@@ -586,7 +587,7 @@
         mScript.simulateTimePassing();
 
         long expectedSystemClockMillis =
-                mScript.calculateTimeInMillisForNow(timeSuggestion.getUtcTime());
+                mScript.calculateTimeInMillisForNow(timeSuggestion.getUnixEpochTime());
         mScript.simulateGnssTimeSuggestion(timeSuggestion)
                 .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis);
     }
@@ -617,7 +618,7 @@
         mScript.simulateTimePassing();
 
         long expectedSystemClockMillis =
-                mScript.calculateTimeInMillisForNow(timeSuggestion.getUtcTime());
+                mScript.calculateTimeInMillisForNow(timeSuggestion.getUnixEpochTime());
         mScript.simulateExternalTimeSuggestion(timeSuggestion)
                 .verifySystemClockWasSetAndResetCallTracking(expectedSystemClockMillis);
     }
@@ -671,7 +672,8 @@
         mScript.simulateTimePassing(smallTimeIncrementMillis)
                 .simulateNetworkTimeSuggestion(networkTimeSuggestion1)
                 .verifySystemClockWasSetAndResetCallTracking(
-                        mScript.calculateTimeInMillisForNow(networkTimeSuggestion1.getUtcTime()));
+                        mScript.calculateTimeInMillisForNow(
+                                networkTimeSuggestion1.getUnixEpochTime()));
 
         // Check internal state.
         mScript.assertLatestTelephonySuggestion(ARBITRARY_SLOT_INDEX, null)
@@ -690,7 +692,8 @@
         mScript.simulateTimePassing(smallTimeIncrementMillis)
                 .simulateTelephonyTimeSuggestion(telephonyTimeSuggestion)
                 .verifySystemClockWasSetAndResetCallTracking(
-                        mScript.calculateTimeInMillisForNow(telephonyTimeSuggestion.getUtcTime()));
+                        mScript.calculateTimeInMillisForNow(
+                                telephonyTimeSuggestion.getUnixEpochTime()));
 
         // Check internal state.
         mScript.assertLatestTelephonySuggestion(ARBITRARY_SLOT_INDEX, telephonyTimeSuggestion)
@@ -700,7 +703,7 @@
 
         // Simulate some significant time passing: half the time allowed before a time signal
         // becomes "too old to use".
-        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_UTC_TIME_AGE_MILLIS / 2)
+        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_SUGGESTION_TIME_AGE_MILLIS / 2)
                 .verifySystemClockWasNotSetAndResetCallTracking();
 
         // Now another network suggestion is made. Telephony suggestions are prioritized over
@@ -720,7 +723,7 @@
         // Simulate some significant time passing: half the time allowed before a time signal
         // becomes "too old to use". This should mean that telephonyTimeSuggestion is now too old to
         // be used but networkTimeSuggestion2 is not.
-        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_UTC_TIME_AGE_MILLIS / 2);
+        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_SUGGESTION_TIME_AGE_MILLIS / 2);
 
         // NOTE: The TimeDetectorStrategyImpl doesn't set an alarm for the point when the last
         // suggestion it used becomes too old: it requires a new suggestion or an auto-time toggle
@@ -743,7 +746,7 @@
 
         // Verify the latest network time now wins.
         mScript.verifySystemClockWasSetAndResetCallTracking(
-                mScript.calculateTimeInMillisForNow(networkTimeSuggestion2.getUtcTime()));
+                mScript.calculateTimeInMillisForNow(networkTimeSuggestion2.getUnixEpochTime()));
 
         // Check internal state.
         mScript.assertLatestTelephonySuggestion(ARBITRARY_SLOT_INDEX, telephonyTimeSuggestion)
@@ -774,7 +777,8 @@
         mScript.simulateTimePassing(smallTimeIncrementMillis)
                 .simulateGnssTimeSuggestion(gnssTimeSuggestion1)
                 .verifySystemClockWasSetAndResetCallTracking(
-                        mScript.calculateTimeInMillisForNow(gnssTimeSuggestion1.getUtcTime()));
+                        mScript.calculateTimeInMillisForNow(
+                                gnssTimeSuggestion1.getUnixEpochTime()));
 
         // Check internal state.
         mScript.assertLatestNetworkSuggestion(null)
@@ -793,7 +797,8 @@
         mScript.simulateTimePassing(smallTimeIncrementMillis)
                 .simulateNetworkTimeSuggestion(networkTimeSuggestion)
                 .verifySystemClockWasSetAndResetCallTracking(
-                        mScript.calculateTimeInMillisForNow(networkTimeSuggestion.getUtcTime()));
+                        mScript.calculateTimeInMillisForNow(
+                                networkTimeSuggestion.getUnixEpochTime()));
 
         // Check internal state.
         mScript.assertLatestNetworkSuggestion(networkTimeSuggestion)
@@ -803,7 +808,7 @@
 
         // Simulate some significant time passing: half the time allowed before a time signal
         // becomes "too old to use".
-        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_UTC_TIME_AGE_MILLIS / 2)
+        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_SUGGESTION_TIME_AGE_MILLIS / 2)
                 .verifySystemClockWasNotSetAndResetCallTracking();
 
         // Now another gnss suggestion is made. Network suggestions are prioritized over
@@ -823,7 +828,7 @@
         // Simulate some significant time passing: half the time allowed before a time signal
         // becomes "too old to use". This should mean that telephonyTimeSuggestion is now too old to
         // be used but networkTimeSuggestion2 is not.
-        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_UTC_TIME_AGE_MILLIS / 2);
+        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_SUGGESTION_TIME_AGE_MILLIS / 2);
 
         // NOTE: The TimeDetectorStrategyImpl doesn't set an alarm for the point when the last
         // suggestion it used becomes too old: it requires a new suggestion or an auto-time toggle
@@ -846,7 +851,7 @@
 
         // Verify the latest gnss time now wins.
         mScript.verifySystemClockWasSetAndResetCallTracking(
-                mScript.calculateTimeInMillisForNow(gnssTimeSuggestion2.getUtcTime()));
+                mScript.calculateTimeInMillisForNow(gnssTimeSuggestion2.getUnixEpochTime()));
 
         // Check internal state.
         mScript.assertLatestNetworkSuggestion(networkTimeSuggestion)
@@ -877,7 +882,8 @@
         mScript.simulateTimePassing(smallTimeIncrementMillis)
                 .simulateExternalTimeSuggestion(externalTimeSuggestion1)
                 .verifySystemClockWasSetAndResetCallTracking(
-                        mScript.calculateTimeInMillisForNow(externalTimeSuggestion1.getUtcTime()));
+                        mScript.calculateTimeInMillisForNow(
+                                externalTimeSuggestion1.getUnixEpochTime()));
 
         // Check internal state.
         mScript.assertLatestNetworkSuggestion(null)
@@ -896,7 +902,8 @@
         mScript.simulateTimePassing(smallTimeIncrementMillis)
                 .simulateNetworkTimeSuggestion(networkTimeSuggestion)
                 .verifySystemClockWasSetAndResetCallTracking(
-                        mScript.calculateTimeInMillisForNow(networkTimeSuggestion.getUtcTime()));
+                        mScript.calculateTimeInMillisForNow(
+                                networkTimeSuggestion.getUnixEpochTime()));
 
         // Check internal state.
         mScript.assertLatestNetworkSuggestion(networkTimeSuggestion)
@@ -906,7 +913,7 @@
 
         // Simulate some significant time passing: half the time allowed before a time signal
         // becomes "too old to use".
-        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_UTC_TIME_AGE_MILLIS / 2)
+        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_SUGGESTION_TIME_AGE_MILLIS / 2)
                 .verifySystemClockWasNotSetAndResetCallTracking();
 
         // Now another external suggestion is made. Network suggestions are prioritized over
@@ -926,7 +933,7 @@
         // Simulate some significant time passing: half the time allowed before a time signal
         // becomes "too old to use". This should mean that networkTimeSuggestion is now too old to
         // be used but externalTimeSuggestion2 is not.
-        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_UTC_TIME_AGE_MILLIS / 2);
+        mScript.simulateTimePassing(TimeDetectorStrategyImpl.MAX_SUGGESTION_TIME_AGE_MILLIS / 2);
 
         // NOTE: The TimeDetectorStrategyImpl doesn't set an alarm for the point when the last
         // suggestion it used becomes too old: it requires a new suggestion or an auto-time toggle
@@ -949,7 +956,7 @@
 
         // Verify the latest external time now wins.
         mScript.verifySystemClockWasSetAndResetCallTracking(
-                mScript.calculateTimeInMillisForNow(externalTimeSuggestion2.getUtcTime()));
+                mScript.calculateTimeInMillisForNow(externalTimeSuggestion2.getUnixEpochTime()));
 
         // Check internal state.
         mScript.assertLatestNetworkSuggestion(networkTimeSuggestion)
@@ -1438,11 +1445,11 @@
          * reference time.
          */
         ManualTimeSuggestion generateManualTimeSuggestion(Instant suggestedTime) {
-            TimestampedValue<Long> utcTime =
+            TimestampedValue<Long> unixEpochTime =
                     new TimestampedValue<>(
                             mFakeEnvironment.peekElapsedRealtimeMillis(),
                             suggestedTime.toEpochMilli());
-            return new ManualTimeSuggestion(utcTime);
+            return new ManualTimeSuggestion(unixEpochTime);
         }
 
         /**
@@ -1472,11 +1479,11 @@
          * reference time.
          */
         NetworkTimeSuggestion generateNetworkTimeSuggestion(Instant suggestedTime) {
-            TimestampedValue<Long> utcTime =
+            TimestampedValue<Long> unixEpochTime =
                     new TimestampedValue<>(
                             mFakeEnvironment.peekElapsedRealtimeMillis(),
                             suggestedTime.toEpochMilli());
-            return new NetworkTimeSuggestion(utcTime);
+            return new NetworkTimeSuggestion(unixEpochTime);
         }
 
         /**
@@ -1484,11 +1491,11 @@
          * reference time.
          */
         GnssTimeSuggestion generateGnssTimeSuggestion(Instant suggestedTime) {
-            TimestampedValue<Long> utcTime =
+            TimestampedValue<Long> unixEpochTime =
                     new TimestampedValue<>(
                             mFakeEnvironment.peekElapsedRealtimeMillis(),
                             suggestedTime.toEpochMilli());
-            return new GnssTimeSuggestion(utcTime);
+            return new GnssTimeSuggestion(unixEpochTime);
         }
 
         /**
@@ -1504,19 +1511,19 @@
          * Calculates what the supplied time would be when adjusted for the movement of the fake
          * elapsed realtime clock.
          */
-        long calculateTimeInMillisForNow(TimestampedValue<Long> utcTime) {
-            return TimeDetectorStrategy.getTimeAt(utcTime, peekElapsedRealtimeMillis());
+        long calculateTimeInMillisForNow(TimestampedValue<Long> unixEpochTime) {
+            return TimeDetectorStrategy.getTimeAt(unixEpochTime, peekElapsedRealtimeMillis());
         }
     }
 
     private static TelephonyTimeSuggestion createTelephonyTimeSuggestion(int slotIndex,
-            TimestampedValue<Long> utcTime) {
+            TimestampedValue<Long> unixEpochTime) {
         return new TelephonyTimeSuggestion.Builder(slotIndex)
-                .setUtcTime(utcTime)
+                .setUnixEpochTime(unixEpochTime)
                 .build();
     }
 
-    private static Instant createUtcTime(int year, int monthInYear, int day, int hourOfDay,
+    private static Instant createUnixEpochTime(int year, int monthInYear, int day, int hourOfDay,
             int minute, int second) {
         return LocalDateTime.of(year, monthInYear, day, hourOfDay, minute, second)
                 .toInstant(ZoneOffset.UTC);