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Gennerally at 4am in the morning but most people dont tend to be awake at that time so either the night before or the night after. However take into considiration that if you have work the next day that you may want to change it the night before on a standard alarm clock just incase.Or people may change there clock when there is a mis haps and they dont have the time

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14y ago

What else can I help you with?