The timestamp service certificate is not valid for time stamping.

时间戳服务证书盖的时间戳无效。

youdao

They allow the client to validate the token, or request that the valid time span for the token be extended or ended.

它们允许此客户机验证此令牌或者请求延长或终止此令牌的有效时间区间。

youdao

Starting at the top of Listing 3, policies are valid for a set period of time.

首先从清单3的顶部开始，策略在一个固定时间段内有效。

youdao

The coupons were issued by the organisation to which the individual was assigned, in the city or village where they were registered as residents, and were valid only for a limited time and place.

ECONOMIST: China

Employers have valid reasons for using part-time staff.

ECONOMIST: The Teamsters and UPS

The courts grant a divorce to mark the end of a marriage that was valid when entered into, whereas an annulment is for a marriage that at no time was valid (as when one of the parties was under the age of consent at the time of the marriage).

FORBES: Kim Kardashian And Kris Humphries - Is There A Tax Angle ?