考虑时区比较倍

Question

据Convert UTC to local time to UTC in Python and Google App Engine，正确的，现在的时间和目标时间比较（考虑不同的时区），我要在目标时间转换为UTC如下：

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(): 
    ... 

问题：

1. 这是正确的吗？

2. 有一个错误信息：

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

   如何解决呢？

Answer 1

它的因为你的datetime对象之一有一个时区设置，另一个没有。
看一看here和here