Good morning to all the English language users who access our beautiful site.
Today's idiom is, "time is up".
This means that the amount of time allowed to do something or finish something is over.
Example 1
Okay everyone, time is up. Please bring your test papers to the front of the class.
Example 2
Oh my goodness, time is almost up. We have to hurry and finish this project by tomorrow or the boss is going to go hog wild.