字符串轉時間對象
time_str = '2020-03-17 16:14:00'
time.strptime(time_str, '%Y-%m-%d %H:%M:%S')
字符串轉時間戳
time_str = '2020-03-17 16:14:00'
timeStamp = int(time.mktime(time.strptime(time_str, '%Y-%m-%d %H:%M:%S')))
時間戳轉字符串
time_str = datetime.fromtimestamp(ts).strftime("%Y-%m-%d %H:%M:%S")
