python str和datetime转换

# str转datetime
datetime.strptime('2023-06-29 15:54:44', '%Y-%m-%d %H:%M:%S')

# datetime转str
datetime.now().strftime('%Y-%m-%d %H:%M:%S')

# 时间差
(now_datetime - last_login_datetime).days
(now_datetime - last_login_datetime).seconds