// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// 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
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

syntax = "proto3";

package google.protobuf;

option cc_enable_arenas = true;
option csharp_namespace = "Google.Protobuf.WellKnownTypes";
option go_package = "github.com/golang/protobuf/ptypes/timestamp";
option java_multiple_files = true;
option java_outer_classname = "TimestampProto";
option java_package = "com.google.protobuf";
option objc_class_prefix = "GPB";

// A Timestamp represents a point in time independent of any time zone
// or calendar, represented as seconds and fractions of seconds at
// nanosecond resolution in UTC Epoch time. It is encoded using the
// Proleptic Gregorian Calendar which extends the Gregorian calendar
// backwards to year one. It is encoded assuming all minutes are 60
// seconds long, i.e. leap seconds are "smeared" so that no leap second
// table is needed for interpretation. Range is from
// `0001-01-01T00:00:00Z` to `9999-12-31T23:59:59.999999999Z`.
// Restricting to that range ensures that conversion to
// and from RFC 3339 date strings is possible.
// See [https://www.ietf.org/rfc/rfc3339.txt](https://www.ietf.org/rfc/rfc3339.txt).
//
// # Examples
//
// Example 1: Compute Timestamp from POSIX `time()`.
//
// ```
// Timestamp timestamp;
// timestamp.set_seconds(time(NULL));
// timestamp.set_nanos(0);
// ```
//
// Example 2: Compute Timestamp from POSIX `gettimeofday()`.
//
// ```
// struct timeval tv;
// gettimeofday(&tv, NULL);
//
// Timestamp timestamp;
// timestamp.set_seconds(tv.tv_sec);
// timestamp.set_nanos(tv.tv_usec * 1000);
// ```
//
// Example 3: Compute Timestamp from Win32 `GetSystemTimeAsFileTime()`.
//
// ```
// FILETIME ft;
// GetSystemTimeAsFileTime(&ft);
// UINT64 ticks = (((UINT64)ft.dwHighDateTime) << 32) | ft.dwLowDateTime;
//
// // A Windows tick is 100 nanoseconds. Windows epoch 1601-01-01T00:00:00Z
// // is 11644473600 seconds before Unix epoch 1970-01-01T00:00:00Z.
// Timestamp timestamp;
// timestamp.set_seconds((INT64) ((ticks / 10000000) - 11644473600LL));
// timestamp.set_nanos((INT32) ((ticks % 10000000) * 100)); //
// ```
//
// Example 4: Compute Timestamp from Java `System.currentTimeMillis()`.
//
// ```
// long millis = System.currentTimeMillis();
//
// Timestamp timestamp = Timestamp.newBuilder().setSeconds(millis / 1000)
//     .setNanos((int) ((millis % 1000) * 1000000)).build();
//
// ```
//
// Example 5: Compute Timestamp from current time in Python.
//
// ```
// timestamp = Timestamp()
// timestamp.GetCurrentTime()
// ```
//
// # JSON Mapping
//
// In JSON format, the `Timestamp` type is encoded as a string in the
// [RFC 3339](https://www.ietf.org/rfc/rfc3339.txt) format. That is, the
// format is `{year}-{month}-{day}T{hour}:{min}:{sec}[.{frac_sec}]Z`
// where `{year}` is always expressed using four digits while `{month}`, `{day}`,
// `{hour}`, `{min}`, and `{sec}` are zero-padded to two digits each. The fractional
// seconds, which can go up to 9 digits (so up to 1 nanosecond resolution),
// are optional. The "Z" suffix indicates the timezone ("UTC"); the timezone
// is required, though only UTC (as indicated by "Z") is presently supported.
//
// For example, `2017-01-15T01:30:15.01Z` encodes 15.01 seconds past
// 01:30 UTC on January 15, 2017.
//
// In JavaScript, you can convert a `Date` object to this format using the
// standard [toISOString()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString)
// method. In Python, you can convert a standard `datetime.datetime` object
// to this format using [`strftime`](https://docs.python.org/2/library/time.html#time.strftime)
// with the time format spec `%Y-%m-%dT%H:%M:%S.%fZ`. Likewise, in Java, you
// can use the Joda Time's [`ISODateTimeFormat.dateTime()`](
// http://www.joda.org/joda-time/apidocs/org/joda/time/format/ISODateTimeFormat.html#dateTime--)
// to obtain a formatter capable of generating timestamps in this format.
//
//
message Timestamp {
  // Represents seconds of UTC time since Unix epoch
  // `1970-01-01T00:00:00Z`. Must be from `0001-01-01T00:00:00Z` to
  // `9999-12-31T23:59:59Z` inclusive.
  int64 seconds = 1;

  // Non-negative fractions of a second at nanosecond resolution. Negative
  // second values with fractions must still have non-negative nano values
  // that count forward in time. Must be from 0 to 999,999,999
  // inclusive.
  int32 nanos = 2;
}