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The time duration from 3am to 12am (midnight) is exactly 21 hours, which equals 1260 minutes or 75600 seconds.
3am to 12am (midnight) spans 21 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 3am (03:00) and 12am (00:00), but you can adjust the date or add seconds for more specific calculations.
When the end time is earlier than the start time, the calculator automatically sets the end date to the next day.
