24-Hour Time Conversion Chart: Military Time to a.m. and p.m., Printable

To convert 24-hour time to a.m. and p.m., keep 0100 to 1159 as a.m. and subtract 12 from 1300 to 2359: 1900 is 7 p.m., and 1430 is 2:30 p.m. The National Institute of Standards and Technology (NIST) Time and Frequency Division describes the 24-hour clock in its “Times of Day FAQs,” and the table below is our own arithmetic from that rule. A printable one-page version is at the end.

24-hour time conversion chart, 0000 to 2300

The four-digit form without a colon is the one commonly called military time. The second column shows the same hour with a colon, the way many clocks and schedules print it. The a.m. and p.m. labels for the two 12 o’clock rows follow the Government Publishing Office (GPO) style; the next section explains why NIST disagrees.

Military time	With colon	a.m. or p.m.
0000	00:00	12 a.m. (midnight)
0100	01:00	1 a.m.
0200	02:00	2 a.m.
0300	03:00	3 a.m.
0400	04:00	4 a.m.
0500	05:00	5 a.m.
0600	06:00	6 a.m.
0700	07:00	7 a.m.
0800	08:00	8 a.m.
0900	09:00	9 a.m.
1000	10:00	10 a.m.
1100	11:00	11 a.m.
1200	12:00	12 p.m. (noon)
1300	13:00	1 p.m.
1400	14:00	2 p.m.
1500	15:00	3 p.m.
1600	16:00	4 p.m.
1700	17:00	5 p.m.
1800	18:00	6 p.m.
1900	19:00	7 p.m.
2000	20:00	8 p.m.
2100	21:00	9 p.m.
2200	22:00	10 p.m.
2300	23:00	11 p.m.

How do you convert military time to a.m. and p.m.?

Read the first two digits as the hour and the last two as the minutes. The minutes never change.

1. 0100 to 1159: the hour is the same, with a.m. Example: 0730 is 7:30 a.m.
2. 1200 to 1259: the hour stays 12, with p.m. Example: 1205 is 12:05 p.m.
3. 1300 to 2359: subtract 12 from the hour, with p.m. Example: 1430 is 2:30 p.m.
4. 0000 to 0059: the hour reads 12 on a 12-hour clock, with a.m. Example: 0005 is 12:05 a.m.

To go the other way, add 12 to any p.m. hour from 1 to 11 (7 p.m. becomes 19, so 1900) and keep the minutes.

Military time	Working	a.m. or p.m.
0005	00 reads as 12	12:05 a.m.
0730	Under 12, keep	7:30 a.m.
1205	12, keep	12:05 p.m.
1430	14 - 12 = 2	2:30 p.m.
1900	19 - 12 = 7	7 p.m.
2245	22 - 12 = 10	10:45 p.m.
2359	23 - 12 = 11	11:59 p.m.

What do 0000, 2400 and 12:01 a.m. mean at midnight?

NIST says of the 12-hour labels: “This is a tricky question because 12 a.m. and 12 p.m. are ambiguous and should not be used.” It adds that “midnight is both twelve hours before noon and twelve hours after noon.” On the 24-hour clock, NIST describes “using the designation of 0000 to refer to midnight at the beginning of a given day” and 2400 for the end of a day.

So 0000 on a date and 2400 on the day before it name the same instant. NIST’s advice for writing a time yourself: “To avoid ambiguity, specification of an event as occurring on a particular day at 11:59 p.m. or 12:01 a.m. is a good idea.” In four digits, that is 2359 or 0001.

The GPO Style Manual, 2008 edition, rule 9.54, lists “12 p.m. (12 noon)” and “12 a.m. (12 midnight).” That differs from NIST’s advice, which is why the table writes “midnight” and “noon” beside those two rows. Our explainer on whether 12 noon is a.m. or p.m. covers that question and a federal agency’s midnight deadline in full. For the date half of a timestamp, see what International Organization for Standardization (ISO) 8601 is, and for midnight at the turn of the year, the New Year countdown by time zone.

Printable 24-hour time conversion chart

The free one-page chart lists all 24 hours from 0000 to 2300 beside their a.m. and p.m. times, the subtract-12 rule and NIST’s midnight note. Keep it by a schedule, or pair it with a printable weekly calendar or the 2027 printable yearly calendar.