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Diffstat (limited to 'Doc/library/datetime.rst')
| -rw-r--r-- | Doc/library/datetime.rst | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Doc/library/datetime.rst b/Doc/library/datetime.rst index de9ad44..c637f6a 100644 --- a/Doc/library/datetime.rst +++ b/Doc/library/datetime.rst @@ -721,6 +721,22 @@ Other constructors, all class methods: It's common for this to be restricted to years in 1970 through 2038. See also :meth:`fromtimestamp`. + On the POSIX compliant platforms, ``utcfromtimestamp(timestamp)`` + is equivalent to the following expression:: + + datetime(1970, 1, 1) + timedelta(seconds=timestamp) + + There is no method to obtain the timestamp from a :class:`datetime` + instance, but POSIX timestamp corresponding to a :class:`datetime` + instance ``dt`` can be easily calculated as follows. For a naive + ``dt``:: + + timestamp = (dt - datetime(1970, 1, 1)) / timedelta(seconds=1) + + And for an aware ``dt``:: + + timestamp = (dt - datetime(1970, 1, 1, tzinfo=timezone.utc)) / timedelta(seconds=1) + .. classmethod:: datetime.fromordinal(ordinal) |