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 (duration.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".
A method that implements different types of operations described in MethodToInvoke.
These different kinds of operations are required to implement message-level operations for
builders in the runtime. This method bundles those operations to reduce the generated methods
count.
NEW_INSTANCE returns a new instance of the protocol buffer that has not yet been
made immutable. See MAKE_IMMUTABLE.
IS_INITIALIZED returns null for false and the default instance for true.
It doesn't use or modify any memoized value.
GET_MEMOIZED_IS_INITIALIZED returns the memoized isInitialized byte
value.
SET_MEMOIZED_IS_INITIALIZED sets the memoized isInitialized byte value to
1 if the first parameter is not null, or to 0 if the first parameter is null.
NEW_BUILDER returns a BuilderType instance.
This method, plus the implementation of the Builder, enables the Builder class to be proguarded
away entirely on Android.
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.
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
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-06 UTC."],[],[]]
