24 Hour Time Calculator

Hours run from 00 (midnight) to 23. Times before 12:00 are morning; 12:00 is noon, 13:00 is 1 PM, and 23:59 is one minute before midnight. There is no AM/PM — the hour number alone tells you the part of the day.

Enter start and end in 24-hour hours and minutes. The calculator finds the difference the same way as 12-hour mode, including overnight spans when the end is earlier on the clock than the start.

It removes ambiguity (no 12 AM vs 12 PM confusion), aligns with ISO and global standards, and matches tools used in transport, medicine, and IT — so handoffs and logs stay consistent across time zones and teams.