Initial import.
diff --git a/include/grpc/support/time.h b/include/grpc/support/time.h
new file mode 100644
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+++ b/include/grpc/support/time.h
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+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __GRPC_SUPPORT_TIME_H__
+#define __GRPC_SUPPORT_TIME_H__
+/* Time support.
+ We use gpr_timespec, which is typedefed to struct timespec on platforms which
+ have it. On some machines, absolute times may be in local time. */
+
+/* Platform specific header declares gpr_timespec.
+ gpr_timespec contains:
+ time_t tv_sec; // seconds since start of 1970
+ int tv_nsec; // nanoseconds; always in 0..999999999; never negative.
+ */
+
+#include <grpc/support/port_platform.h>
+
+#if defined(GPR_POSIX_TIME)
+#include <grpc/support/time_posix.h>
+#elif defined(GPR_WIN32)
+#include <grpc/support/time_win32.h>
+#else
+#error could not determine platform for time
+#endif
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Time constants. */
+extern const gpr_timespec gpr_time_0; /* The zero time interval. */
+extern const gpr_timespec gpr_inf_future; /* The far future */
+extern const gpr_timespec gpr_inf_past; /* The far past. */
+
+#define GPR_MS_PER_SEC 1000
+#define GPR_US_PER_SEC 1000000
+#define GPR_NS_PER_SEC 1000000000
+#define GPR_NS_PER_MS 1000000
+#define GPR_NS_PER_US 1000
+#define GPR_US_PER_MS 1000
+
+/* Return the current time measured from the system's default epoch. */
+gpr_timespec gpr_now(void);
+
+/* Return -ve, 0, or +ve according to whether a < b, a == b, or a > b
+ respectively. */
+int gpr_time_cmp(gpr_timespec a, gpr_timespec b);
+
+/* Add and subtract times. Calculations saturate at infinities. */
+gpr_timespec gpr_time_add(gpr_timespec a, gpr_timespec b);
+gpr_timespec gpr_time_sub(gpr_timespec a, gpr_timespec b);
+
+/* Return a timespec representing a given number of microseconds. LONG_MIN is
+ interpreted as gpr_inf_past, and LONG_MAX as gpr_inf_future. */
+gpr_timespec gpr_time_from_micros(long x);
+gpr_timespec gpr_time_from_nanos(long x);
+gpr_timespec gpr_time_from_millis(long x);
+gpr_timespec gpr_time_from_seconds(long x);
+gpr_timespec gpr_time_from_minutes(long x);
+gpr_timespec gpr_time_from_hours(long x);
+
+/* Return 1 if two times are equal or within threshold of each other,
+ 0 otherwise */
+int gpr_time_similar(gpr_timespec a, gpr_timespec b, gpr_timespec threshold);
+
+/* Sleep until at least 'until' - an absolute timeout */
+void gpr_sleep_until(gpr_timespec until);
+
+struct timeval gpr_timeval_from_timespec(gpr_timespec t);
+
+gpr_timespec gpr_timespec_from_timeval(struct timeval t);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __GRPC_SUPPORT_TIME_H__ */