24 Hour Time

24 hour time is the time keeping which is based on the 24-hour clock.

By this convention a day is divided into twenty-four hours, numbered from 0 to 23, starting exactly at midnight and ending a short moment before midnight, indicating the hours passed.

On this site you can find plenty of information related to 24-hour time, 12-hour time and the conversion between these two systems. Right below you can find our 24 hour clock converter.

24 Hour Clock Converter

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Our calculator shows your local time converted to 12-hour time.This Time Converter is Really Cool! Click To Tweet

If you like to change any other time in 24-hour time format explained below, hit the reset button, then insert your hours and minutes as indicated in the input form.

24 Hour Time Format

According to the International Organization for Standardization ISO 8601 standard, a time in the 24-hour time format is written in the syntax HH:MM, or in the extended syntax HH:MM:SS, H = Hours, M = Minutes and S = Seconds.

Numbers denoting hours less than 10 usually have a leading zero; for minutes smaller than 10 this is a “must”.

For example: 07:45, 10:01, 16:50:59.

Frequent conversions include:

Keep reading to find the 24 hour time conversion method, along with examples.

24 Hour Time Conversion

Supposed your time is HH:MM, observe that the minutes (MM) never change and process the case whose condition is true:

  • If HH = 0, HH changes to 12. Add “ am”.
    By way of illustration: 00:15 → 12:15 am
  • If HH ≥ 1 and HH ≤ 11, HH remains the same. Add “ am”.
    For instance: 08:45 → 08:45 am
  • If HH = 12, HH the same. Add “ pm”.
    For example: 12:05 → 12:05 pm
  • If HH ≥ 13 and HH ≤ 23, subtract 12 from HH. Add “ pm”.
    For illustration: 16:30 → 4:30 pm

Instead of am, to indicate “ante meridiem”, Latin “before midday”, you may write a.m., AM or A.M.

In place of of pm, to denote “post meridiem”, Latin “past midday”, you may use p.m., PM and P.M.

24 Hour Clock Time Now

Our 24 hour time clock displays your local current time:

In the section ahead you can locate a few interesting frequently asked questions.


  • When does a day begin?

    A day starts at 00:00 = 12:00 am, that is shortly after midnight.

  • When does a day end?

    A day ends at 23:59:59 = 11:59:59 pm, that is shortly before midnight.

  • Which is correct 24:00 or 00:00?

    Strictly speaking, midnight is 00:00 as displayed by digital 24-hour clocks and watches.

    If midnight means the end of a day 24:00 can be seen sometimes, though.

24 Tour Time Chart

24-hour clock12-hour clock
00:0012:00 AM
01:001:00 AM
02:002:00 AM
03:003:00 AM
04:004:00 AM
05:005:00 AM
06:006:00 AM
07:007:00 AM
08:008:00 AM
09:009:00 AM
10:0010:00 AM
11:0011:00 AM
12:0012:00 PM
13:001:00 PM
14:002:00 PM
15:003:00 PM
16:004:00 PM
17:005:00 PM
18:006:00 PM
19:007:00 PM
20:008:00 PM
21:009:00 PM
22:0010:00 PM
23:0011:00 PM

Bottom Line

The 24-hour clock system is the most frequent time notation in the world, employed in a wide range of situations and by many organizations and industries, in addition to its use where space is limited as it without “am” and “pm”.

24 Hour Time

It is sometimes also called continental time, railway time and military time, and, among others, has the advantages unambiguity and easier time calculations.

However, some countries, including, but not limited to, English-speaking ones, use the 12-hour time for general time telling.

A mixture of the two time notations can be come across as well, depending on whether the time is told in speech or writing, as well as on context.

Further Information:

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