expiry

1. N-UNCOUNT The expiry of something such as a contract, deadline, or visa is the time that it comes to an end or stops being valid. 期满[英国英语]

The United Mine Workers are not on strike today, despite the expiry of their contract at midnight. 联合矿业工会今天没有罢工，尽管他们的合同于午夜期满。