Australia/Sydney timezone conversions not reversible

[Paul Haesler]

The "Australia/Sydney" timezone behaves incorrectly when converting to UTC.

1) For a start its repr() looks suspicious:

     <DstTzInfo 'Australia/Sydney' LMT+10:05:00 STD>

    +10:05 ??

2) Conversions are not reversible. Note for this example I deliberately choose a date well away from timezone transitions:

>>> utc = pytz.utc
>>> autz = pytz.timezone('Australia/Sydney')
>>> dtutc = datetime.datetime(2015,6,15, 12, 0, 0, 0, utc)
>>> dtutc.astimezone(autz)
datetime.datetime(2015, 6, 15, 22, 0, tzinfo=<DstTzInfo 'Australia/Sydney' AEST+10:00:00 STD>)

OK That looks correct - even the repr of the tzinfo looks correct. But let's try the same thing in reverse.

>>> dtautz = datetime.datetime(2015,6,15, 22,0,0,0, autz)
>>> dtautz.astimezone(utc)
datetime.datetime(2015, 6, 15, 11, 55, tzinfo=<UTC>)

Note that this is wrong by 5 minutes.

[Paul Haesler (paul-haesler)]

I tried upgrading pytz, but it is still occurring in 2015.4.

[Paul Haesler (paul-haesler)]

Ugh. Nevermind, I see what I did wrong.