datetime with pytz timezone. Different offset depending on how tzinfo is set [duplicate]

Answer 1

According to the documentation, the correct way to apply a time zone to a naive datetime is with the localize method.

ts1 = eastern.localize(datetime.datetime.now())

Also, I recommend you use avoid EST as a variable name, since it typically standard for "Eastern Standard Time", and America/New_York comprises both "Eastern Standard Time" (EST) and "Eastern Daylight Time" (EDT).