datetime 转字符串
create_on.strftime('%Y-%m-%d %H:%M:%S')
字符串转datetime
collect_on = datetime.datetime.strptime(collect_on_str, '%Y%m%d%H%M%S')
datetime转时间戳
time.mktime(create_on.timetuple())
时间戳转datetime
req_datetime = datetime.datetime.fromtimestamp(timestamp)
计算时间差
time_delta = (collect_on - interval_datetime).seconds
时间差转datetime
interval_group_end = interval_group_start + datetime.timedelta(seconds=duration)
