Day travel card 怎样计算过期?

请教高人，Day Travel Card, 怎样计算过期？若我在星期一晚上 20：30进站的，是不是到星期二的20：30 过期呢？ 我查了http://www.tfl.gov.uk/ 实在不理解以下的官方解释:


Day Travelcards (Peak)

Can be used all day Mondays to Fridays, on the day of validity and for any journey that starts before 0430 the following day


3 Day Travelcards (Peak)

Can be used all day on each day of validity and for any journey that starts before 0430 on the day following the expiry date.


Thanks in advance!