24-hour clock
20:21
What Time Is 20:21?
20:21 in 24-hour time is 8:21 PM on a 12-hour clock.
12-hour clock
8:21 PM
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8:21 PM 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 8:21 PM