// 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
// 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.

syntax = "proto3";

package google.protobuf;
option go_package = "github.com/golang/protobuf/ptypes/duration";

option csharp_namespace = "Google.Protobuf.WellKnownTypes";
option java_package = "com.google.protobuf";
option java_outer_classname = "DurationProto";
option java_multiple_files = true;
option java_generate_equals_and_hash = true;
option objc_class_prefix = "GPB";

// A Duration represents a signed, fixed-length span of time represented
// as a count of seconds and fractions of seconds at nanosecond
// resolution. It is independent of any calendar and concepts like "day"
// or "month". It is related to Timestamp in that the difference between
// two Timestamp values is a Duration and it can be added or subtracted
// from a Timestamp. Range is approximately +-10,000 years.
//
// Example 1: Compute Duration from two Timestamps in pseudo code.
//
//     Timestamp start = ...;
//     Timestamp end = ...;
//     Duration duration = ...;
//
//     duration.seconds = end.seconds - start.seconds;
//     duration.nanos = end.nanos - start.nanos;
//
//     if (duration.seconds < 0 && duration.nanos > 0) {
//       duration.seconds += 1;
//       duration.nanos -= 1000000000;
//     } else if (durations.seconds > 0 && duration.nanos < 0) {
//       duration.seconds -= 1;
//       duration.nanos += 1000000000;
//     }
//
// Example 2: Compute Timestamp from Timestamp + Duration in pseudo code.
//
//     Timestamp start = ...;
//     Duration duration = ...;
//     Timestamp end = ...;
//
//     end.seconds = start.seconds + duration.seconds;
//     end.nanos = start.nanos + duration.nanos;
//
//     if (end.nanos < 0) {
//       end.seconds -= 1;
//       end.nanos += 1000000000;
//     } else if (end.nanos >= 1000000000) {
//       end.seconds += 1;
//       end.nanos -= 1000000000;
//     }
//
message Duration {

  // Signed seconds of the span of time. Must be from -315,576,000,000
  // to +315,576,000,000 inclusive.
  int64 seconds = 1;

  // Signed fractions of a second at nanosecond resolution of the span
  // of time. Durations less than one second are represented with a 0
  // `seconds` field and a positive or negative `nanos` field. For durations
  // of one second or more, a non-zero value for the `nanos` field must be
  // of the same sign as the `seconds` field. Must be from -999,999,999
  // to +999,999,999 inclusive.
  int32 nanos = 2;
}
