考慮時區比較倍

Question

據Convert UTC to local time to UTC in Python and Google App Engine，正確的，現在的時間和目標時間比較（考慮不同的時區），我要在目標時間轉換爲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(): 
    ... 

問題：

1. 這是正確的嗎？

2. 有一個錯誤信息：

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

   如何解決呢？

Answer 1

它的因爲你的datetime對象之一有一個時區設置，另一個沒有。
看一看here和here