diff --git a/common/clock.cc b/common/clock.cc
new file mode 100644
index 0000000..f0eff44
--- /dev/null
+++ b/common/clock.cc
@@ -0,0 +1,58 @@
+//
+// Copyright (C) 2013 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 "update_engine/common/clock.h"
+
+#include <time.h>
+
+namespace chromeos_update_engine {
+
+base::Time Clock::GetWallclockTime() {
+  return base::Time::Now();
+}
+
+base::Time Clock::GetMonotonicTime() {
+  struct timespec now_ts;
+  if (clock_gettime(CLOCK_MONOTONIC_RAW, &now_ts) != 0) {
+    // Avoid logging this as an error as call-sites may call this very
+    // often and we don't want to fill up the disk. Note that this
+    // only fails if running on ancient kernels (CLOCK_MONOTONIC_RAW
+    // was added in Linux 2.6.28) so it never fails on a ChromeOS
+    // device.
+    return base::Time();
+  }
+  struct timeval now_tv;
+  now_tv.tv_sec = now_ts.tv_sec;
+  now_tv.tv_usec = now_ts.tv_nsec/base::Time::kNanosecondsPerMicrosecond;
+  return base::Time::FromTimeVal(now_tv);
+}
+
+base::Time Clock::GetBootTime() {
+  struct timespec now_ts;
+  if (clock_gettime(CLOCK_BOOTTIME, &now_ts) != 0) {
+    // Avoid logging this as an error as call-sites may call this very
+    // often and we don't want to fill up the disk. Note that this
+    // only fails if running on ancient kernels (CLOCK_BOOTTIME was
+    // added in Linux 2.6.39) so it never fails on a ChromeOS device.
+    return base::Time();
+  }
+  struct timeval now_tv;
+  now_tv.tv_sec = now_ts.tv_sec;
+  now_tv.tv_usec = now_ts.tv_nsec/base::Time::kNanosecondsPerMicrosecond;
+  return base::Time::FromTimeVal(now_tv);
+}
+
+}  // namespace chromeos_update_engine