What military time is equivalent to 9:00 PM?

The equivalent of 9:00 PM in military time is 2100 hours. In military time, hours are counted from 00 to 23, with the day starting at 00:00 (midnight) and running through to 23:59 (one minute before midnight).

To convert standard time to military time, you add 12 to the PM hours past 12:00 (noon). Since 9:00 PM is after noon, you take the hour, which is 9, and add 12, resulting in 21. Thus, 9:00 PM becomes 2100 hours in military time. This format is used for clarity and to avoid ambiguity in communication, especially in military operations where precise timing is vital.