Bugs item #1447945, was opened at 2006-03-11 13:51
Message generated for change (Comment added) made by tim_one
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Ilpo Nyyssönen (biny)
Assigned to: Nobody/Anonymous (nobody)
Summary: Unable to stringify datetime with tzinfo
Initial Comment:
zdump -v Europe/Helsinki | head -5 gives
Europe/Helsinki Fri Dec 13 20:45:52 1901 UTC = Fri Dec
13 22:25:44 1901 EET isdst=0 gmtoff=5992
Europe/Helsinki Sat Dec 14 20:45:52 1901 UTC = Sat Dec
14 22:25:44 1901 EET isdst=0 gmtoff=5992
Europe/Helsinki Sat Apr 30 22:20:07 1921 UTC = Sat Apr
30 23:59:59 1921 EET isdst=0 gmtoff=5992
Europe/Helsinki Sat Apr 30 22:20:08 1921 UTC = Sun May
1 00:20:08 1921 EET isdst=0 gmtoff=7200
Europe/Helsinki Thu Apr 2 21:59:59 1942 UTC = Thu Apr
2 23:59:59 1942 EET isdst=0 gmtoff=7200
Europe/Helsinki Thu Apr 2 22:00:00 1942 UTC = Fri Apr
3 01:00:00 1942 EEST isdst=1 gmtoff=10800
Python 2.4.1 (#1, May 16 2005, 15:19:29)
[GCC 4.0.0 20050512 (Red Hat 4.0.0-5)] on linux2
Type "help", "copyright", "credits" or "license" for
more information.
->> from datetime import datetime
->> from dateutil import tz
->> str(datetime(1920, 1, 1, 0, 0,
tzinfo=tz.gettz('Europe/Helsinki')))
Traceback (most recent call last):
File "<input>", line 2, in ?
ValueError: tzinfo.utcoffset() must return a whole
number of minutes
->>
tz.gettz('Europe/Helsinki').utcoffset((datetime(1900,
1, 1, 0, 0)))
datetime.timedelta(0, 5992)
->>
----------------------------------------------------------------------
>Comment By: Tim Peters (tim_one)
Date: 2006-03-11 15:38
Message:
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I don't know that this needs "a solution", but doubt
anything relevant is going to change in Python regardless --
that utcoffset() must return a whole number of minutes has
been documented from the start, and in several years hasn't
caused anyone else a problem.
Do you really believe that Helsinki was once 99 minutes and
52 seconds off from UTC? I don't ;-) Seems more likely
that your installation's time zone info is corrupt; that
this specific piece of historical time zone info is wrong
but nobody noticed before ("historical" because it's
certainly not the case that Helsinki is ever 5992 seconds
off from UTC in current reality); or that `dateutil` has a
relevant error.
----------------------------------------------------------------------
Comment By: Ilpo Nyyssönen (biny)
Date: 2006-03-11 14:12
Message:
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What do you think is best solution?
1) Python datetime is changed to tolerate more.
2) Linux tzdata package is changed to contain only full
minute offsets. Who is going to convince them that this is
good idea?
3) The python-dateutil tz library is changed to touch the
information provided by the operating system.
----------------------------------------------------------------------
Comment By: Ilpo Nyyssönen (biny)
Date: 2006-03-11 14:06
Message:
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The error is from datetime and it is from python
distribution. The tz uses operating systems information
about the timezones and as the zdump shows, it gets there
utcoffset that is not full minute.
----------------------------------------------------------------------
Comment By: Tim Peters (tim_one)
Date: 2006-03-11 13:58
Message:
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What's this?
>>> from dateutil import tz
There is no `dateutil` module in the Python distribution (in
which case problems with `dateutil` should be directed to
its developers, not to the Python tracker).
----------------------------------------------------------------------
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