Yesterday I switched my Linux machines to use clockspeed 0.62 and therefore had to switch to the right/EST5EDT timezone. Today my client calls rather upset that lots of data has disappeared from his database, etc.. So while I have found and fixed a bunch of timezone conversion problems in my code, I'm stumped by DateTime.strftime(). I'm working with Zope 2.6.0 but the code is the same in 2.7.0b2 Basically, I get this situation:
dx '2003-12-01 00:00:00' y = DateTime.DateTime(dx) y DateTime('2003/12/01') y.strftime("%a %b. %d") 'Sun Nov. 30' y.strftime("%a %b %d %H:%M:%S") 'Sun Nov 30 23:59:38' y.Time() '00:00:00'
So, the DateTime object knows the correct year, month and day, it's mishandling of 'diff' in strftime is a problem. I can't quite figure out what the regex does in the code below, but diff is 22 seconds off from the "regular timezone offset". That's will be lost in the divide by 36. The timezone offset that _tzoffset calculates is wrong:
DateTime._tzoffset(y._tz, y._t) -18000
Because
y._tz 'US/Eastern'
(but it should be 'right/EST5EDT') What's the best way for me to fix this? I'll submit a patch if I can get a clue. Btw, the timezone right/EST5EDT isn't in DateTime's timezone listing. Shouldn't Zope get this data from Python? I'll remark that Python doesn't know about the 'correct' offset either.
import time time.tzname ('EST', 'EDT') time.timezone 18000
Well now I'm stuck, I've set /etc/localtime and /usr/share/zoneinfo/posixrules correctly, and "date" returns the correct time. However even forcing TZ with Python 2.3 doesn't work correctly. sh-2.05b$ TZ="right/EST5EDT" python2.3 Python 2.3.2 (#2, Nov 6 2003, 10:44:39) [GCC 3.2.2 20030222 (Red Hat Linux 3.2.2-5)] on linux2 Type "help", "copyright", "credits" or "license" for more information.
import os os.environ['TZ'] 'right/EST5EDT' import time time.timezone 18000 time.tzname ('EST', 'EDT') time.tzset() time.tzname ('EST', 'EDT') time.timezone 18000
How does time.localtime() know the correct timezone offset, but time.timezone is not correct?
time.localtime(); os.system('date') (2003, 12, 1, 12, 55, 25, 0, 335, 0) Mon Dec 1 12:55:25 EST 2003
----- DateTime.py def strftime(self, format): # Format the date/time using the *current timezone representation*. diff = _tzoffset(self._tz, self._t) format = re.sub('(^\|[^%])%z', '\\1%+05d' % (diff / 36), format) return strftime(format, safegmtime(self.timeTime() + diff)) -- Brad Clements, bkc@murkworks.com (315)268-1000 http://www.murkworks.com (315)268-9812 Fax http://www.wecanstopspam.org/ AOL-IM: BKClements