python 1970年以前 字符串转换时间戳

代码1

　　

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from datetime import datetime  result = '1970-01-01 07:00:00'  time_1 = '1966-07-17 06:03:00'  if time_1 > result:      array = time.strptime(time_1, "%Y-%m-%d %H:%M:%S")      publishTime = int(time.mktime(array)) * 1000      print(publishTime)  else:      time_1_struct = datetime.strptime(time_1, "%Y-%m-%d %H:%M:%S")      time_2_struct = datetime.strptime(result, "%Y-%m-%d %H:%M:%S")      seconds = (time_2_struct - time_1_struct).seconds      print('-' + str(seconds))

　　代码2

　　

from datetime import datetime
epoch = datetime(1970, 1, 1)
t = datetime(1956, 3, 2)
diff = t - epoch
print(diff.days * 24 * 3600 + diff.seconds)