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How can I format date using timezone?

Posted on 2010-08-26
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Last Modified: 2012-05-10
Hi,

How can I format date using timezone using the epoch time? Using python 2.5
i.e.
t = time.gmtime(sec)
print time.strftime("%b %d %Y %H:%M:%S", t)
returns Aug 26 2010 16:53:49, which is GMT time

t = time.localtime(sec)
print time.strftime("%b %d %Y %H:%M:%S", t)
returns Aug 26 2010 9:53:49, which is PST

How can I get this in Mountain timezone, any other timezone the user passes in?

Also, where are the list of timezone constants in Python?

Thanks
Jamie

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Question by:jamie_lynn
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markaaa earned 200 total points
ID: 33534372
The Python standard library doesn't contain timezone information and doesn't have good timezone support. You will need to use a package such as pytz and there are still some platform specific issues. You can get pytz here and they show examples of usage. http://pytz.sourceforge.net/
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Author Comment

by:jamie_lynn
ID: 33538699
Hi markaaa,

If my localtime is UTC,
In the standard library, is there way determine if daylight savings for Pacific? with this info, i can calculate the offset from GMT.

Thanks
Jamie
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Assisted Solution

by:pepr
pepr earned 300 total points
ID: 33539229
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Assisted Solution

by:pepr
pepr earned 300 total points
ID: 33540321
As markaaa suggested, you probably should download the pytz (http://sourceforge.net/projects/pytz/).  After installation ('python setup.py install' from the directory created from the unzipped archive).

Try the snippet below. It generates the files with timezones, and it shows the same UTC time naturally for different timezones.  It shows the following on my machine:

C:\tmp\___python\jamie_lynn\Q_26432050>a.py
Generating 'all_timezones.txt'
Generating 'common_timezones.txt'
Generating 'US_timezones.txt'
UTC 2010-08-27 09:52:36 UTC+0000
Australia/Sydney 2010-08-27 19:52:36 EST+1000
Pacific/Auckland 2010-08-27 21:52:36 NZST+1200
import datetime
import pytz
import time

fname = 'all_timezones.txt'
print 'Generating', repr(fname)
f = open(fname, 'w')
for z in pytz.all_timezones:
    f.write(repr(z) + '\n')  # repr() to wrap in quotes
f.close()

fname = 'common_timezones.txt'
print 'Generating', repr(fname)
f = open(fname, 'w')
for z in pytz.common_timezones:
    f.write(repr(z) + '\n')
f.close()

fname = 'US_timezones.txt'
print 'Generating', repr(fname)
f = open(fname, 'w')
for z in pytz.country_timezones('US'):
    f.write(repr(z) + '\n')
f.close()



fmt = '%Y-%m-%d %H:%M:%S %Z%z'

utc_dt = pytz.utc.localize(datetime.datetime.utcnow())
print 'UTC', utc_dt.strftime(fmt)

au_tz = pytz.timezone('Australia/Sydney')
au_dt = au_tz.normalize(utc_dt.astimezone(au_tz))
print 'Australia/Sydney', au_dt.strftime(fmt)

pa_tz = pytz.timezone('Pacific/Auckland')
pa_dt = pa_tz.normalize(utc_dt.astimezone(pa_tz))
print 'Pacific/Auckland', pa_dt.strftime(fmt)

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