24-hour clock
06:21
What Time Is 06:21?
06:21 in 24-hour time is 6:21 AM on a 12-hour clock.
12-hour clock
6:21 AM
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6:21 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 6:21 AM