text: // 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 csharp_namespace = "Google.Protobuf.WellKnownTypes";
  option cc_enable_arenas = true;
  option go_package = "github.com/golang/protobuf/ptypes/duration";
  option java_package = "com.google.protobuf";
  option java_outer_classname = "DurationProto";
  option java_multiple_files = 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.
  //
  // # Examples
  //
  // 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;
  //     }
  //
  // Example 3: Compute Duration from datetime.timedelta in Python.
  //
  //     td = datetime.timedelta(days=3, minutes=10)
  //     duration = Duration()
  //     duration.FromTimedelta(td)
  //
  // # JSON Mapping
  //
  // In JSON format, the Duration type is encoded as a string rather than an
  // object, where the string ends in the suffix "s" (indicating seconds) and
  // is preceded by the number of seconds, with nanoseconds expressed as
  // fractional seconds. For example, 3 seconds with 0 nanoseconds should be
  // encoded in JSON format as "3s", while 3 seconds and 1 nanosecond should
  // be expressed in JSON format as "3.000000001s", and 3 seconds and 1
  // microsecond should be expressed in JSON format as "3.000001s".
  //
  //
  message Duration {
  
    // Signed seconds of the span of time. Must be from -315,576,000,000
    // to +315,576,000,000 inclusive. Note: these bounds are computed from:
    // 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
    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;
  }
  