24-hour clock
05:21
What Time Is 05:21?
05:21 in 24-hour time is 5:21 AM on a 12-hour clock.
12-hour clock
5:21 AM
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5:21 AM is a clock reading, not a countdown target. Use a how-long-until page to time it.
Countdown to this clock time: how long until 5:21 AM