Converting time zones for datetime objects in Python
Install pytz
I am using
pytz, which is
a time zone definitions package. You can install it using Easy Install.
On Ubuntu, do this:
sudo easy_install --upgrade pytz
Add time zone information to a naive datetime object
from datetime import datetime
from pytz import timezone
date_str = "2009-05-05 22:28:15"
datetime_obj = datetime.strptime(date_str, "%Y-%m-%d %H:%M:%S")
datetime_obj_utc = datetime_obj.replace(tzinfo=timezone('UTC'))
print datetime_obj_utc.strftime("%Y-%m-%d %H:%M:%S %Z%z")
Results:
2009-05-05 22:28:15 UTC+0000
Add non-UTC time zone information to a naive datetime object
(Added 2014-05-28)
NOTE:
datetime.replace() does not handle daylight savings time
correctly. The correct way is to use
timezone.localize() instead.
Using
datetime.replace() is OK when working with UTC as shown above
because it does not have daylight savings time transitions to deal with.
See the
pytz documentation.
from datetime import datetime
from pytz import timezone
date_str = "2014-05-28 22:28:15"
datetime_obj_naive = datetime.strptime(date_str, "%Y-%m-%d %H:%M:%S")
# Wrong way!
datetime_obj_pacific = datetime_obj_naive.replace(tzinfo=timezone('US/Pacific'))
print datetime_obj_pacific.strftime("%Y-%m-%d %H:%M:%S %Z%z")
# Right way!
datetime_obj_pacific = timezone('US/Pacific').localize(datetime_obj_naive)
print datetime_obj_pacific.strftime("%Y-%m-%d %H:%M:%S %Z%z")
Results:
2014-05-28 22:28:15 PST-0800
2014-05-28 22:28:15 PDT-0700
Convert time zones
from datetime import datetime
from pytz import timezone
fmt = "%Y-%m-%d %H:%M:%S %Z%z"
# Current time in UTC
now_utc = datetime.now(timezone('UTC'))
print now_utc.strftime(fmt)
# Convert to US/Pacific time zone
now_pacific = now_utc.astimezone(timezone('US/Pacific'))
print now_pacific.strftime(fmt)
# Convert to Europe/Berlin time zone
now_berlin = now_pacific.astimezone(timezone('Europe/Berlin'))
print now_berlin.strftime(fmt)
Results:
2009-05-06 03:09:49 UTC+0000
2009-05-05 20:09:49 PDT-0700
2009-05-06 05:09:49 CEST+0200
List time zones
There are 559 time zones included in pytz. Here's how to print the
US time zones:
from pytz import all_timezones
print len(all_timezones)
for zone in all_timezones:
if 'US' in zone:
print zone
Results:
US/Alaska
US/Aleutian
US/Arizona
US/Central
US/East-Indiana
US/Eastern
US/Hawaii
US/Indiana-Starke
US/Michigan
US/Mountain
US/Pacific
US/Pacific-New
US/Samoa
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