import time
 
def unix_time(dt):
  #转换成时间数组
  timeArray = time.strptime(dt, "%Y-%m-%d %H:%M:%S")
  #转换成时间戳
  timestamp = time.mktime(timeArray)
  return timestamp
 
def local_time(timestamp):
  #转换成localtime
  time_local = time.localtime(timestamp)
  #转换成新的时间格式(2016-05-05 20:28:54)
  dt = time.strftime("%Y-%m-%d %H:%M:%S", time_local)
  return dt
 
if __name__ == '__main__':
  time_now = '2018-09-25 15:33:20'
  unix_t = unix_time(time_now)
  local_t = local_time(unix_t)
  print(unix_t)