Randomizer formulas take a seed that the random number is based on (a certain seed will always produce the same result). Choose a seed that changes when you want the result to change. You can put anything you want in there. Here are some examples with time-based formulas.
This number is updated every day:
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Formula: RandomIntFromSeed( Today() ) 
This number is updated every minute:
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Formula: RandomIntFromSeed( Now().DateTimeTruncate("minute") ) 
This is last minute’s number:
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Formula: RandomIntFromSeed( Now().DateTimeTruncate("minute") - minutes(1) )