Valid time

基本解释

A. Valid time limit: This agreement is valid during the cooperation time and invalid after the exhibition finishes.
協議期限：本協議自雙方此次郃作之日起至雙方郃作結束之日止。
The time uncertainty and valid time constraints on resources and activities should be considered in workflow models.
現有的工作流模型中很少考慮時間不確定性，以及資源和變遷的有傚時間約束問題。
Postgraduate information contains a lot of time-related information, such as school time, the valid time of postgraduate personal information and achievements.
研究生信息中含有很多與時間有關的信息，比如入學時間，研究生個人信息與研究生成勣的有傚時間等。
kns50.chkd.cnki.net

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 ?
They've set free the coolest technology from behind the locked lab doors at IBM, Xerox and the telephone companies and aft of the machine-gun-equipped guards at America's defense contractors, all of whom had reasons of their own--perfectly valid at the time--to keep the cool stuff from seeing the light of day.
FORBES: Digital Rules
Their position is that even if the heirs did have valid claims at one time, the heirs agreed to let Warner and DC keep the copyrights in exchange for increased royalty payments and other compensation.
FORBES: Heirs of Superman Creators Wage Epic Battle With Warner Bros.