The hours from 0-11 denote what would be the AM hours on a 12-hour clock, while hours 12-23 denote the PM hours of a 12-hour clock.

This time format is an international standard, and is often used to avoid the ambiguity resulting from the use of a 12-hour clock. Using the terms '12 midnight' and '12 noon' can remove ambiguity in cases where a person may not be accustomed to conventions.Ī 24-hour clock typically uses the numbers 0-23, where 00:00 indicates midnight, and a day runs from midnight to midnight over the course of 24 hours. On digital clocks and watches, 'AM' stands for ante meridiem, meaning 'before midday,' while 'PM' stands for post meridiem, or 'after noon.' By convention, 12 AM denotes midnight, while 12 PM denotes noon. Depending on the clock being used, most analog clocks or watches may not include an indication of whether the time is in the morning or evening. Most people read time using either a 12-hour clock or a 24-hour clock.Ī 12-hour clock uses the numbers 1-12. Convert timezones and find the best time for your meeting in But in 1793, the French smashed the old clock system in favor of French Revolutionary Time, which was a 10-hour day.

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