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.
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.
By restricting to that range, we ensure that we can convert to
and from RFC 3339 date strings.
See [https://www.ietf.org/rfc/rfc3339.txt](https://www.ietf.org/rfc/rfc3339.txt).
Represents seconds of UTC time since Unix epoch
1970-01-01T00:00:00Z. Must be from from 0001-01-01T00:00:00Z to
9999-12-31T23:59:59Z inclusive.
nanos
Non-negative fractions of a second at nanosecond resolution. Negative
second values with fractions must still have non-negative nanos values
that count forward in time. Must be from 0 to 999,999,999
inclusive.
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. By restricting to that range, we ensure that we can convert to and from RFC 3339 date strings. See [https://www.ietf.org/rfc/rfc3339.txt](https://www.ietf.org/rfc/rfc3339.txt).
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.
now = time.time() seconds = int(now) nanos = int((now - seconds) * 10**9) timestamp = Timestamp(seconds=seconds, nanos=nanos)
Represents seconds of UTC time since Unix epoch 1970-01-01T00:00:00Z. Must be from from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59Z inclusive.
Non-negative fractions of a second at nanosecond resolution. Negative second values with fractions must still have non-negative nanos values that count forward in time. Must be from 0 to 999,999,999 inclusive.