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diff --git a/runtime/base/time_utils.h b/runtime/base/time_utils.h
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+/*
+ * Copyright (C) 2015 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 ART_RUNTIME_BASE_TIME_UTILS_H_
+#define ART_RUNTIME_BASE_TIME_UTILS_H_
+
+#include <stdint.h>
+#include <string>
+#include <time.h>
+
+#include "base/macros.h"
+
+namespace art {
+
+enum TimeUnit {
+  kTimeUnitNanosecond,
+  kTimeUnitMicrosecond,
+  kTimeUnitMillisecond,
+  kTimeUnitSecond,
+};
+
+// Returns a human-readable time string which prints every nanosecond while trying to limit the
+// number of trailing zeros. Prints using the largest human readable unit up to a second.
+// e.g. "1ms", "1.000000001s", "1.001us"
+std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits = 3);
+
+// Format a nanosecond time to specified units.
+std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit,
+                           size_t max_fraction_digits);
+
+// Get the appropriate unit for a nanosecond duration.
+TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration);
+
+// Get the divisor to convert from a nanoseconds to a time unit.
+uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit);
+
+// Returns the current date in ISO yyyy-mm-dd hh:mm:ss format.
+std::string GetIsoDate();
+
+// Returns the monotonic time since some unspecified starting point in milliseconds.
+uint64_t MilliTime();
+
+// Returns the monotonic time since some unspecified starting point in microseconds.
+uint64_t MicroTime();
+
+// Returns the monotonic time since some unspecified starting point in nanoseconds.
+uint64_t NanoTime();
+
+// Returns the thread-specific CPU-time clock in nanoseconds or -1 if unavailable.
+uint64_t ThreadCpuNanoTime();
+
+// Converts the given number of nanoseconds to milliseconds.
+static constexpr inline uint64_t NsToMs(uint64_t ns) {
+  return ns / 1000 / 1000;
+}
+
+// Converts the given number of milliseconds to nanoseconds
+static constexpr inline uint64_t MsToNs(uint64_t ns) {
+  return ns * 1000 * 1000;
+}
+
+#if defined(__APPLE__)
+// No clocks to specify on OS/X, fake value to pass to routines that require a clock.
+#define CLOCK_REALTIME 0xebadf00d
+#endif
+
+// Sleep for the given number of nanoseconds, a bad way to handle contention.
+void NanoSleep(uint64_t ns);
+
+// Initialize a timespec to either a relative time (ms,ns), or to the absolute
+// time corresponding to the indicated clock value plus the supplied offset.
+void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts);
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_BASE_TIME_UTILS_H_