Do the time the search warrant is obtain have to be on the warrant?

The judge who signs the warrant dates it. It is valid to execute for seven days.

No. Its not the polices job to show you the warrant as long as they have a valid one. By the time they leave your house you will have one posted on your door or given to you personally. As long as...

By presenting a document known as an 'affidavit' to a judge or magistrate in which the probable cause is outlined and sworn to under oath.

Unclear what the questioner is asking. . . that the warrant was supposed to be served at a specific time, on a specific date? The only time/date that I am aware of that appears on search warrants is...

Whenever they have probable cause, or when they have definite evidence.