[issue2736] datetime needs and "epoch" method

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Le Saturday 15 November 2008 04:17:50 Alexander Belopolsky, vous avez écrit :
> it is really unnecessary because it can be
> written as epoch + timedelta(0, seconds, microseconds).

I tried yesterday and it doesn't work!

datetime.datetime(1970, 1, 1, 1, 0)
>>> t1 = epoch + timedelta(seconds=-1660000000)
>>> t2 = datetime.fromtimestamp(-1660000000)
>>> t2
datetime.datetime(1917, 5, 26, 1, 53, 20)
>>> t1 - t2
datetime.timedelta(0)
>>> t2 = datetime.fromtimestamp(-1670000000)
>>> t2
datetime.datetime(1917, 1, 30, 7, 6, 40)
>>> t1 = epoch + timedelta(seconds=-1670000000)
>>> t1 - t2
datetime.timedelta(0, 3600)

We lost an hour durint the 1st World War :-)

Whereas my implementation using mktime() works:

-1670000000.0

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<http://bugs.python.org/issue2736>
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