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I have a date and a time that I'm attempting to combine in Python. The time is timezone aware.
However, when I try and combine them, I get the wrong time.
import pytz
from datetime import time, date
NYC_TIME = pytz.timezone('America/New_York')
start_date = date(2012, 7, 7)
start_time = time(hour = 0, tzinfo = NYC_TIME)
combined = datetime.combine(start_date, start_time)
print combined
print NYC_TIME.normalize(combined)
This prints 2012-07-07 00:00:00-05:00, which normalizes to 2012-07-07 01:00:00-04:00. Why is this happening? How can I avoid it?
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You can also use the pytz module to create timezone-aware objects. For this, we will store the current date and time in a new variable using the datetime. now() function of datetime module and then we will add the timezone using timezone function of pytz module.
The easiest way to tell if a datetime object is naive is by checking tzinfo. tzinfo will be set to None of the object is naive. To make a datetime object offset aware, you can use the pytz library. First, you have to instantiate a timezone object, and then use that timezone object to "localize" a datetime object.
Format UTC DateTime to Get the timezone name Extract the timezone name from UTC DateTime using the DateTime formatting in Python. Use the %Z directive to get the timezone name.
A time without a date attached must assume it's not in the Daylight Saving period. Once you attach a date to it, that assumption can be corrected. The zone offset changes, and the time changes as well to keep it at the same UTC equivalent.
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