Given a timestamp without time zone (eg 2018-03-12 09:30:00
) AND the timezone EST5EDT
, the goal is to parse the data returning a datetime object that is time zone AND daylight saving aware.
from datetime import datetime
import pytz
datetime(2018, 3, 8, 9, 30, tzinfo=pytz.timezone('EST5EDT')).astimezone(pytz.utc)
# returns:
# datetime.datetime(2018, 3, 8, 14, 30, tzinfo=<UTC>)
datetime(2018, 3, 12, 9, 30, tzinfo=pytz.timezone('EST5EDT')).astimezone(pytz.utc)
# returns:
# datetime.datetime(2018, 3, 12, 14, 30, tzinfo=<UTC>)
# BUT should return (second Sunday of march the daylight saving changes by 1 hour):
# datetime.datetime(2018, 3, 12, 13, 30, tzinfo=<UTC>)
Never set tzinfo
directly when creating datetimes. Always use the localize()
method of the timezone (see the note at the top of http://pytz.sourceforge.net/ ):
pytz.timezone('EST5EDT').localize(
datetime(2018, 3, 12, 9, 30)
).astimezone(pytz.utc)
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