12 hour to 24 hour converter calculator

Use the calculators below to find the number of hours and minutes between two times. For a full time card, please use the Time Card Calculator.

Hours Between Two Dates

An hour is most commonly defined as a period of time equal to 60 minutes, where a minute is equal to 60 seconds, and a second has a rigorous scientific definition. There are also 24 hours in a day. Most people read time using either a 12-hour clock or a 24-hour clock.

12-hour clock:

A 12-hour clock uses the numbers 1-12. 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. 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. Using the terms "12 midnight" and "12 noon" can remove ambiguity in cases where a person may not be accustomed to conventions.

24-hour clock:

A 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. This time format is an international standard, and is often used to avoid the ambiguity resulting from the use of a 12-hour clock. 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. In certain countries, 24-hour time is referred to as military time, since this is the time format used by militaries (and other entities) around the world, where unambiguous time measurement is particularly important.

Hours in different time periods

Calculator Use

Convert military time to regular time with the Military Time Converter. This calculator also does conversion to military time from regular time.

This converter assumes 12:00 am is midnight, and 12:00 pm is noon.

How to Convert to Military Time

To convert from regular time to military time refer to the time chart below or follow these steps.

• If the time is morning or am remove the colon. Military time is the same as regular time in the morning hours. Add a leading zero if the time is earlier than 10 am. For example, 9:30 am is 0930 in military time.
• If the time is after 12:59 pm, remove the colon and add 12 hours to the regular time. For example if the time is 4:24 pm, remove the colon and add 12 hours to get 1624 in military time.
• If the time is 12:00 am midnight to 12:59 am, remove the colon and subtract 12 hours. For example 12:08 am is 0008 in military time.
• 12:00 am midnight in military time is 0000 hours at the beginning of a day or event, and 2400 hours at the end of the day or event.

How to Convert from Military Time to Regular Time

To convert from military time to regular time refer to the time chart below or follow these steps.

• If military time is 0000 to 0059, insert a colon and add 12 hours. Include am for morning.
• If military time is 0100 to 1159, remove leading 0's, insert a colon and include am for morning
• If military time is 1200 to 1259, insert a colon and include pm to indicate the time is after 12:00 noon
• If military time is 1300 to 2359, insert a colon and subtract 12 hours. Include pm to indicate the time is after 12:00 noon.
• 0000 and 2400 in military time are the same as 12:00 am midnight.

See our separate page including a Military Time Chart and Military Minutes Chart.

Print Military Time Chart

0000

12:00 am
12 midnight

1200

12:00 pm
12 noon

0030

12:30 am

1230

12:30 pm

0100

1:00 am

1300

1:00 pm

0130

1:30 am

1330

1:30 pm

0200

2:00 am

1400

2:00 pm

0230

2:30 am

1430

2:30 pm

0300

3:00 am

1500

3:00 pm

0330

3:30 am

1530

3:30 pm

0400

4:00 am

1600

4:00 pm

0430

4:30 am

1630

4:30 pm

0500

5:00 am

1700

5:00 pm

0530

5:30 am

1730

5:30 pm

0600

6:00 am

1800

6:00 pm

0630

6:30 am

1830

6:30 pm

0700

7:00 am

1900

7:00 pm

0730

7:30 am

1930

7:30 pm

0800

8:00 am

2000

8:00 pm

0830

8:30 am

2030

8:30 pm

0900

9:00 am

2100

9:00 pm

0930

9:30 am

2130

9:30 pm

1000

10:00 am

2200

10:00 pm

1030

10:30 am

2230

10:30 pm

1100

11:00 am

2300

11:00 pm

1130

11:30 am

2330

11:30 pm

1200

12:00 pm
12 noon

2400

12:00 am
12 midnight

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