Enter a four-digit time such as 1730 to get 5:30 PM, or a standard time such as 5:30 PM to get 1730. Midnight is 0000 and noon is 1200. Every whole hour has its own page, and the result pages include a chart of all 24 hours.
For PM hours add 12 (except 12 PM, which stays 12). For AM hours keep the number (except 12 AM, which becomes 00). To go back, subtract 12 from hours above 12.
The U.S. military, hospitals, aviation, transport, emergency services and many countries use the 24-hour clock in daily life.
Subtract 12 from hours above 12 and use PM.
5:00 PM.
Midnight, 12:00 AM.
Noon, 12:00 PM.
Not used for a time of day.
Zero eight hundred.
Military time is written with four digits.
1700.