Utc Time 24 Hour Clock


Normally time is shown as Hours:Minutes

24-hour clock 12-hour clock; 00:00: 12.00a.m. midnight 01:00: 1:00 a.m. 02:00: The 24-hour clock is a way of telling the time in which the day runs from midnight to midnight and is divided into 24 hours, numbered from 0 to 24. UTC was ultimately seen as the proper abbreviation as it corresponded to the abbreviations for Universal Time. As previously mentioned, Coordinated Universal Time is a 24-hour time standard for the world. It is unique in that it is not affected by daylight savings time and is thought to be similar to Greenwich Mean Time or GMT. Have one of these 24 hour clocks, but every time it acquires the WWVB signal, in 24 hour mode, reflects, 14:00 hours (example) instead of 19:00 UTC. My other little atomic clocks work okay but cannot get this wall mount clock to display the UTC time in 24 hour format (the little ones are also 12/24 hour clocks).

There are 24 Hours in a Day and 60 Minutes in each Hour.

Showing the Time

There are two main ways to show the time: '24 Hour Clock' or 'AM/PM':

24 Hour Clock: the time is shown as how many hours and minutes since midnight.

Is Utc Time 24 Hour

(or '12 Hour Clock'): the day is split into:
  • the 12 Hours running from Midnight to Noon (the AM hours), and
  • the other 12 Hours running from Noon to Midnight (the PM hours).

Like this (try the slider):


Post Meridiem*
Latin for 'after midday'

Midnight to Noon

24 Hour Clock:
12:00 to 23:59

*Is that spelled 'Meridiem' or 'Meridian'? See here.

Converting AM/PM to 24 Hour Clock

Add 12 to any hour after Noon (and subtract 12 for the first hour of the day):

For the first hour of the day (12 Midnight to 12:59 AM), subtract 12 Hours

From 1:00 AM to 12:59 PM, no change

Examples: 11:20 AM = 11:20, 12:30 PM = 12:30

Utc Time 24 Hour Clock Download

From 1:00 PM to 11:59 PM, add 12 Hours

Converting 24 Hour Clock to AM/PM

For the first hour of the day (00:00 to 00:59), add 12 Hours, make it 'AM'

Examples: 00:10 = 12:10 AM, 00:40 = 12:40 AM

From 01:00 to 11:59, just make it 'AM'


From 12:00 to 12:59, just make it 'PM'

Examples: 12:10 = 12:10 PM, 12:55 = 12:55 PM

From 13:00 to 23:59, subtract 12 Hours, make it 'PM'

Comparison Chart

Here is a side-by-side comparison of the 24 Hour Clock and AM/PM:

Example: 10 minutes past
24 Hour Clock
00:0012 Midnight
00:1012:10 AM
01:001:00 AM01:101:10 AM
02:002:00 AM02:102:10 AM
03:003:00 AM03:103:10 AM
04:004:00 AM04:104:10 AM
05:005:00 AM05:105:10 AM
06:006:00 AM06:106:10 AM
07:007:00 AM07:107:10 AM
08:008:00 AM08:108:10 AM
09:009:00 AM09:109:10 AM
10:0010:00 AM10:1010:10 AM
11:0011:00 AM11:1011:10 AM
12:0012 Noon12:1012:10 PM
13:001:00 PM13:101:10 PM
14:002:00 PM14:102:10 PM
15:003:00 PM15:103:10 PM
16:004:00 PM16:104:10 PM
17:005:00 PM17:105:10 PM
18:006:00 PM18:106:10 PM
19:007:00 PM19:107:10 PM
20:008:00 PM20:108:10 PM
21:009:00 PM21:109:10 PM
22:0010:00 PM22:1010:10 PM
23:0011:00 PM23:1011:10 PM

Midnight and Noon

How do you merge cells in word. '12 AM' and '12 PM' can cause confusion, so we prefer '12 Midnight' and '12 Noon'.

What Day is Midnight?

Midnight has another problem: there is nothing to tell us 'is this the beginning or ending of the day'.

Imagine your friends say they are leaving for holiday at 'midnight' on 12th March, what day should you arrive to say goodbye?

Do you get there on the 11th (assuming they leave at the very start of the 12th), or the 12th (assuming they leave at the end of the 12th)?

It is better to use:

Utc time 24 hour clock
  • 11:59 PM or 12:01 AM, or
  • 23:59 or 00:01 (24-Hour Clock)

which the railroads, airlines and military actually do.

So, when you see something like 'offer ends midnight October 15th' tell them to use one minute before or after so there is no confusion!

Footnote on 'Meridiem' vs 'Meridian'

Should 'AM' be 'ante meridiem' or 'ante meridian' (likewise for PM)?

Coordinated Universal Time Utc

The official (according to an American, Australian and British dictionary I checked), and most common spelling for AM is 'ante meridiem' which is a Latin phrase. I recommend that spelling!

Utc Time 24 Hour Clock

But people sometimes use the phrase 'ante meridian' (a 'meridian' in this case refers to an imaginary line in the sky when the sun is at its highest point).