What time is 2123 in military time?

2123 (or 21:23) is 9:23 PM.

Military time	2123 hours
24-hour clock	21:23
12-hour clock	9:23 PM
Said out loud	“twenty-one twenty-three hours”
Minutes after midnight	1,283
Share of the day gone	89.1%

How to convert 2123

The hour is 21, which is more than 12, so subtract 12: 21 − 12 = 9. Keep the minutes (23) and add PM. That gives 9:23 PM.