python 带时区的日期格式化操作

  def getTimeStamp(self, date):
    result = re.search(r"[\-\+]\d+", date)
    if result:
      time_area = result.group()
      symbol = time_area[0]
      offset = int(time_area[1]) + int(time_area[2])
      if symbol == "+":
        format_str = '%a, %d %b %Y %H:%M:%S '+ time_area
        if "UTC" in date:
          format_str = '%a, %d %b %Y %H:%M:%S '+ time_area+ ' (UTC)'
        if "GMT" in date:
          format_str = '%a, %d %b %Y %H:%M:%S ' + time_area + ' (GMT)'
        if "CST" in date:
          format_str = '%a, %d %b %Y %H:%M:%S ' + time_area + ' (CST)'
        utcdatetime = time.strptime(date, format_str)
        tempsTime = time.mktime(utcdatetime)
        tempsTime = datetime.datetime.fromtimestamp(tempsTime)
        if offset > 8:
          offset = offset -8
        tempsTime = tempsTime + datetime.timedelta(hours=offset)
        localtimestamp = tempsTime.strftime("%Y-%m-%d")
      else:
        format_str = '%a, %d %b %Y %H:%M:%S ' + time_area
        utcdatetime = time.strptime(date, format_str)
        tempsTime = time.mktime(utcdatetime)
        tempsTime = datetime.datetime.fromtimestamp(tempsTime)
        tempsTime = tempsTime + datetime.timedelta(hours=(offset + 8))
        localtimestamp = tempsTime.strftime("%Y-%m-%d")
    return localtimestamp

import pytz
from tzlocal import get_localzone
tz = get_localzone()  #获得本地timezone
utc = pytz.utc     #获得UTC timezone
dt = datetime(2016, 6, 12, 5, 0, 0)
loc_dt = tz.localize(dt) #将DateTime数据贴上timezone
utc_dt = loc_dt.astimezone(utc)  #转换到新的timezone

import pytz
from tzlocal import get_localzone
utc = pytz.utc
tz = get_localzone()
t = datetime(x,x,x,x,x,x)
utc_dt = utc.localize(t)
loc_dt = utc_dt.astimezone(tz)