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The time duration from 6pm to 12am (midnight) is exactly 6 hours, which equals 360 minutes or 21600 seconds.
6pm to 12am (midnight) spans 6 hours. This period is during the evening hours when many people are finishing their workday and heading home.
The calculator above automatically sets the times to 6pm (18:00) 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.