通过考虑时区比较时间

Question

According to Convert UTC to local time to UTC in Python and Google App Engine , to correctly compare the times of now and a target time (considering different time zones), I have to convert the target time to UTC as follows:

import pytz

def toUTC(date, tz):
    tz = pytz.timezone('Asia/Taipei')
    utc = pytz.timezone('UTC')
    d_tz = tz.normalize(tz.localize(date))
    d_utc = d_tz.astimezone(utc)
    return d_utc

days = 10
minutes = 20
targetTime = datetime.datetime(2012,12,22,0,0,0)
targetTime = targetTime + datetime.timedelta(days=days, minutes=minutes)
targetTime = toUTC(targetTime) 

if targetTime < datetime.datetime.now():
    ...

Questions:

1. Is this correct?

2. There is an error message:

   TypeError: can't compare offset-naive and offset-aware datetimes

   How to solve it?

Answer 1

its because one of your datetime objects has a timezone set and the other one doesn't.
take a look here and here