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Hours 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.

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

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Midnight Confusion

Another source of confusion is the lack of a date designator in the 12-hour system, making it impossible to logically identify a correct moment in time when only a date and 12:00 am (midnight) is provided.

Imagine being asked to pick up a friend at the airport at 12:00 am on April 13. Would you go there at midnight between April 12 and April 13? Or 24 hours later?

One way to overcome this problem is to sacrifice accuracy for clarity. Your friend could ask you to be at the airport at 12:01 am on April 13 or, if the following midnight is meant, at 11:59 pm on April 13. Alternatively, the 24-hour format could be used. Here, 0:00 refers to midnight at the beginning of the day while 24:00 is midnight at the end of the day.

Time Formats

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»

Examples: 01:15 = 1:15 AM, 11:25 = 11:25 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»

Examples: 14:55 = 2:55 PM, 23:30 = 11:30 PM

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

Example: on the hour
Example: 10 minutes past
24 Hour Clock
24 Hour Clock

«12 AM» and «12 PM» can cause confusion, so we prefer «12 Midnight» and «12 Noon».

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:

• 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)?

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

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).

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Bad title

The requested page title is invalid. It may be empty, contain unsupported characters, or include a non-local or incorrectly linked interwiki prefix. You may be able to locate the desired page by searching for its name (with the interwiki prefix, if any) in the search box.

Possible causes are:

• an attempt to load a URL such as https://en.wikipedia.org/wiki/| (the | character is unsupported);
• an attempt to load a URL pointing to a «non-local» interwiki page (usually those not run by the Wikimedia Foundation). For example, the URL https://en.wikipedia.org/wiki/meatball:WikiPedia will give this error, because the «meatball:» interwiki prefix is not marked as local in the interwiki table. Certain interwiki prefixes are marked as local in the table. For example, the URL https://en.wikipedia.org/wiki/meta:Main_Page can be used to load meta:Main_Page. All interlanguage prefixes are marked as local, and thus URLs such as https://en.wikipedia.org/wiki/fr:Accueil will work as expected. However, non-local interwiki pages can still be accessed by interwiki linking or by entering them in the search box. For example [[meatball:WikiPedia]] can be used on a page, like this: meatball:WikiPedia.

Retrieved from «https://en.wikipedia.org/wiki/Special:Badtitle»

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Bad title

The requested page title is invalid. It may be empty, contain unsupported characters, or include a non-local or incorrectly linked interwiki prefix. You may be able to locate the desired page by searching for its name (with the interwiki prefix, if any) in the search box.

Possible causes are:

• an attempt to load a URL such as https://en.wikipedia.org/wiki/| (the | character is unsupported);
• an attempt to load a URL pointing to a «non-local» interwiki page (usually those not run by the Wikimedia Foundation). For example, the URL https://en.wikipedia.org/wiki/meatball:WikiPedia will give this error, because the «meatball:» interwiki prefix is not marked as local in the interwiki table. Certain interwiki prefixes are marked as local in the table. For example, the URL https://en.wikipedia.org/wiki/meta:Main_Page can be used to load meta:Main_Page. All interlanguage prefixes are marked as local, and thus URLs such as https://en.wikipedia.org/wiki/fr:Accueil will work as expected. However, non-local interwiki pages can still be accessed by interwiki linking or by entering them in the search box. For example [[meatball:WikiPedia]] can be used on a page, like this: meatball:WikiPedia.

Retrieved from «https://en.wikipedia.org/wiki/Special:Badtitle»

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Источники:

https://en.wikipedia.org/wiki/Prime_Minister_of_the_United_Kingdom&rut=6996b50a16c76e0b086b736dd37204b95d594dc75a6245bb0e27b1971c1d55e3
https://www.calculator.net/hours-calculator.html&rut=772689e123012dd555844c6bd7a2afbd7733c5374922cf663ea8fa06d32b08cc
https://ell.stackexchange.com/questions/41415/at-vs-by-in-time-expressions&rut=72052c8942e34befa8ba422e9e79d9f4457d5e4b98eecabaa541f2613884f9f6
https://www.timeanddate.com/time/am-and-pm.html&rut=b89593f546d629b0a469601aa85e9c648583a5df252464d5250519436d7edb5d
https://www.mathsisfun.com/time.html&rut=327ba1b9f5efd235f7d2505dbe15667fc0732f1582c34c8fe5dc024421cd833e
https://www.britannica.com/topic/12-hour-clock&rut=9032f6e55546c61db29e131d142d848c50e67f25c639b6eff5e5cebe16d67651
https://dictionary.cambridge.org/dictionary/english/pm&rut=e2577f22e583871efa778340ce05f0d053ff97de19fe8dd0c4f9382ebb2fbbf3
https://en.wikipedia.org/wiki/List_of_prime_ministers_of_the_United_Kingdom_by_length_of_tenure&rut=fd504a2d8b46bca938c1069cd6536aad9b41ff85bec9aa0a0526da293dbb292b
https://en.wikipedia.org/wiki/List_of_prime_ministers_of_India&rut=b1800b1248743c82602953357c8c49d5a741264383d81dfb2af4de8e71f8f600