Paul Pinterits added the comment:
I see. You're right, it does make a difference.
However, this behaviour is quite unexpected. Perhaps I just didn't read the
docs carefully enough, but it wasn't clear to me that the time module had such
half-baked support for time zones.
An unsuspecting user, like me, reads the documentation on strptime, which
directs you to strftime. There you read that %z is a supported directive. Along
the way you've come across the conversion table, which tells you that mktime()
can convert struct_time objects to timestamps. But then when you try to parse a
time string, the information gets lost somewhere along the way:
>>> mktime(strptime("+0000", "%z")) == mktime(strptime("+0200", "%z"))
True
If you visit the section about struct_time objects, you find this footnote:
"Changed in version 3.3: tm_gmtoff and tm_zone attributes are available on
platforms with C library supporting the corresponding fields in struct tm."
But even after reading that, I'd still expect the tm_gmtoff attribute to have
some sort of effect and not get silently discarded.
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<http://bugs.python.org/issue29964>
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