diff --git a/bootstat/Android.bp b/bootstat/Android.bp
index 95c9af5..f744ad1 100644
--- a/bootstat/Android.bp
+++ b/bootstat/Android.bp
@@ -16,6 +16,7 @@
 
 bootstat_lib_src_files = [
     "boot_event_record_store.cpp",
+    "uptime_parser.cpp",
 ]
 
 cc_defaults {
diff --git a/bootstat/boot_event_record_store.cpp b/bootstat/boot_event_record_store.cpp
index 3243676..2648594 100644
--- a/bootstat/boot_event_record_store.cpp
+++ b/bootstat/boot_event_record_store.cpp
@@ -20,16 +20,13 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <utime.h>
-
-#include <chrono>
 #include <cstdlib>
 #include <string>
 #include <utility>
-
-#include <android-base/chrono_utils.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/parseint.h>
+#include "uptime_parser.h"
 
 namespace {
 
@@ -58,9 +55,7 @@
 }
 
 void BootEventRecordStore::AddBootEvent(const std::string& event) {
-  auto uptime = std::chrono::duration_cast<std::chrono::seconds>(
-      android::base::boot_clock::now().time_since_epoch());
-  AddBootEventWithValue(event, uptime.count());
+  AddBootEventWithValue(event, bootstat::ParseUptime());
 }
 
 // The implementation of AddBootEventValue makes use of the mtime file
diff --git a/bootstat/boot_event_record_store_test.cpp b/bootstat/boot_event_record_store_test.cpp
index 0df6706..90f6513 100644
--- a/bootstat/boot_event_record_store_test.cpp
+++ b/bootstat/boot_event_record_store_test.cpp
@@ -21,18 +21,15 @@
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <unistd.h>
-
-#include <chrono>
 #include <cstdint>
 #include <cstdlib>
-
-#include <android-base/chrono_utils.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/test_utils.h>
 #include <android-base/unique_fd.h>
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>
+#include "uptime_parser.h"
 
 using testing::UnorderedElementsAreArray;
 
@@ -92,12 +89,6 @@
   rmdir(path.c_str());
 }
 
-// Returns the time in seconds since boot.
-time_t GetUptimeSeconds() {
-  return std::chrono::duration_cast<std::chrono::seconds>(
-      android::base::boot_clock::now().time_since_epoch()).count();
-}
-
 class BootEventRecordStoreTest : public ::testing::Test {
  public:
   BootEventRecordStoreTest() {
@@ -135,7 +126,7 @@
   BootEventRecordStore store;
   store.SetStorePath(GetStorePathForTesting());
 
-  time_t uptime = GetUptimeSeconds();
+  time_t uptime = bootstat::ParseUptime();
   ASSERT_NE(-1, uptime);
 
   store.AddBootEvent("cenozoic");
@@ -150,7 +141,7 @@
   BootEventRecordStore store;
   store.SetStorePath(GetStorePathForTesting());
 
-  time_t uptime = GetUptimeSeconds();
+  time_t uptime = bootstat::ParseUptime();
   ASSERT_NE(-1, uptime);
 
   store.AddBootEvent("cretaceous");
diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index d594cdb..a7354a7 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -21,7 +21,6 @@
 #include <getopt.h>
 #include <unistd.h>
 
-#include <chrono>
 #include <cmath>
 #include <cstddef>
 #include <cstdio>
@@ -32,7 +31,6 @@
 #include <vector>
 
 #include <android/log.h>
-#include <android-base/chrono_utils.h>
 #include <android-base/logging.h>
 #include <android-base/parseint.h>
 #include <android-base/strings.h>
@@ -40,6 +38,7 @@
 #include <metricslogger/metrics_logger.h>
 
 #include "boot_event_record_store.h"
+#include "uptime_parser.h"
 
 namespace {
 
@@ -248,8 +247,7 @@
   BootEventRecordStore boot_event_store;
   BootEventRecordStore::BootEventRecord record;
 
-  auto uptime = std::chrono::duration_cast<std::chrono::seconds>(
-      android::base::boot_clock::now().time_since_epoch());
+  time_t uptime = bootstat::ParseUptime();
   time_t current_time_utc = time(nullptr);
 
   if (boot_event_store.GetBootEvent("last_boot_time_utc", &record)) {
@@ -276,22 +274,22 @@
     // Log the amount of time elapsed until the device is decrypted, which
     // includes the variable amount of time the user takes to enter the
     // decryption password.
-    boot_event_store.AddBootEventWithValue("boot_decryption_complete", uptime.count());
+    boot_event_store.AddBootEventWithValue("boot_decryption_complete", uptime);
 
     // Subtract the decryption time to normalize the boot cycle timing.
-    std::chrono::seconds boot_complete = std::chrono::seconds(uptime.count() - record.second);
+    time_t boot_complete = uptime - record.second;
     boot_event_store.AddBootEventWithValue(boot_complete_prefix + "_post_decrypt",
-                                           boot_complete.count());
+                                           boot_complete);
 
 
   } else {
     boot_event_store.AddBootEventWithValue(boot_complete_prefix + "_no_encryption",
-                                           uptime.count());
+                                           uptime);
   }
 
   // Record the total time from device startup to boot complete, regardless of
   // encryption state.
-  boot_event_store.AddBootEventWithValue(boot_complete_prefix, uptime.count());
+  boot_event_store.AddBootEventWithValue(boot_complete_prefix, uptime);
 
   RecordInitBootTimeProp(&boot_event_store, "ro.boottime.init");
   RecordInitBootTimeProp(&boot_event_store, "ro.boottime.init.selinux");
diff --git a/bootstat/uptime_parser.cpp b/bootstat/uptime_parser.cpp
new file mode 100644
index 0000000..7c2034c
--- /dev/null
+++ b/bootstat/uptime_parser.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "uptime_parser.h"
+
+#include <time.h>
+#include <cstdlib>
+#include <string>
+#include <android-base/file.h>
+#include <android-base/logging.h>
+
+namespace bootstat {
+
+time_t ParseUptime() {
+  std::string uptime_str;
+  if (!android::base::ReadFileToString("/proc/uptime", &uptime_str)) {
+    PLOG(ERROR) << "Failed to read /proc/uptime";
+    return -1;
+  }
+
+  // Cast intentionally rounds down.
+  return static_cast<time_t>(strtod(uptime_str.c_str(), NULL));
+}
+
+}  // namespace bootstat
\ No newline at end of file
diff --git a/bootstat/uptime_parser.h b/bootstat/uptime_parser.h
new file mode 100644
index 0000000..756ae9b
--- /dev/null
+++ b/bootstat/uptime_parser.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef UPTIME_PARSER_H_
+#define UPTIME_PARSER_H_
+
+#include <time.h>
+
+namespace bootstat {
+
+// Returns the number of seconds the system has been on since reboot.
+time_t ParseUptime();
+
+}  // namespace bootstat
+
+#endif  // UPTIME_PARSER_H_
\ No newline at end of file