Talk:24-hour clock

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Navy Correspondence Manual[edit]

U.S. Navy and U.S. Marine Corps use 0001 to 2400 [1] SECNAV M-5216.5 Department of the Navy Correspondance Manual dated March 2010, Chapter 2, Section 5 Paragraph 15. Expressing Military Time.

(page 18) PerkinsC (talk) 20:08, 7 April 2014 (UTC)
i placed the text already, but it does NOT look right where it is, please fix... there are two places where this information might be relevant, but i put it in the part that references the joint Communication protocol as the usages appear to contradict each other PerkinsC (talk) 20:36, 7 April 2014 (UTC)
the Correspondance Manual covers everything from eMail traffic to hard Copy letters that are sent through the mail. the Exact Text Follows

15. ExpressingMilitary Time. Express military time in four digits based on the 24-hour clock.

The time range is 0001 to 2400. The first two digits are the hour after midnight and the last two digits are the minutes. Do not use a colon to separate the hour from the minutes. EXAMPLE: 6:30 am in civilian time is 0630 in military time

3:45 pm in civilian time is 1545 in military time"

PerkinsC (talk) 20:49, 7 April 2014 (UTC)

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Can the "hundred" be dropped?[edit]

Can the "hundred" be dropped when saying the time in 24-hr notation? For example, is it okay to say "thirteen" instead of "thirteen hundred"? Thanks. (talk) 16:24, 9 July 2017 (UTC)

@ I live in the UK (and have lived in other English-speaking countries) and we use 24-hour notation regularly. But never verbally or written out in words (only numbers, i.e. 21:15 is spoken as "nine fifteen PM" or "quarter past nine"). What you are talking about is military time (distinct from normal 24-hour notation), and there are regulations on how to use it verbally. I've only seen it being used in films and fiction books. I hope that helps you as you search for your answer. This might help: --BurritoBazooka Talk Contribs 17:46, 9 July 2017 (UTC)
the "hundred" is to indicate that it is 00 minutes... PerkinsC (talk) 19:32, 5 September 2017 (UTC)
Although "hundred" is sometimes employed colloquially (a hangover from military usage, I suspect) -- e.g. "If you miss the fifteen thirty-nine, there's another train at sixteen hundred" -- the BBC World Service announces programmes as starting at "seven hours", "fourteen hours", "twenty-one hours" etc. -- Picapica (talk) 16:51, 12 May 2018 (UTC)

Leading zeros?[edit]

Do you have to include leading zeros in the 24-hour clock? I am not talking about military time, i am talking about the regular 24-hour clock. I hate leading zeros and can they be dropped? For example, is it okay to say 9:00 instead of 09:00? Thanks! (talk) 14:55, 30 July 2017 (UTC)

For the record, these questions should generally be asked at the reference desk. Prinsgezinde (talk) 17:59, 21 January 2018 (UTC)
Leading zeros are always employed in four-figure notation -- e.g. "There are flights at 0630, 0955, 1315, and 1645". They may be omitted, however, when the hours are separated from the minutes by punctuation (a colon -- or, in the UK as often as not -- a period): 6:30 or 9.55. Nevertheless, the use of leading zeros is good practice, in making it quite clear that 06:30 or 09.55 are morning times. -- Picapica (talk) 17:04, 12 May 2018 (UTC)

Times of 24:01 and later (after midnight) are used in the United States, also[edit]

I'm glad the main article has a section about times notated as being after 24:00, such as 25:08 meaning 1:08 AM on the following day. I have seen this used in at least two US cities in multiple contexts, but always in reference to a business or other entity that operates on a daily cycle, but the operational day ends after midnight. For instance, I worked with a factory where the operational day went from 06:00 (6 AM) until 26:00 (2 AM on the following day), but the workers on-shift at 25:59 are always the same people who were on-shift at 23:30, and that is important to remember. It should be easily visible in all of the logs, and so on. Hospitals use 24-hour clocks for a similar reason, so that it doesn't roll over at noon (which is usually not a shift change), but hospitals are always open around-the-clock, so it needs to roll over somewhere, and the sensible default is midnight. A factory that closes at 2 AM can roll over at some ill-defined time between closing and opening. If you lock up a bit late, you can record that as 26:05. If you arrive a bit early, you can record that as 05:50. In both cases, you are outside the operational hours, but your choice of notations shows whether you are the first shift arriving early or the final shift leaving late. I have no citations, this entire article would be better if it had citations and were longer and more nuanced, I just have some forbidden Original Research. Fluoborate (talk) 05:47, 13 May 2018 (UTC)

Zulu time[edit]

The convention of adding "Z" to 24-hour time notation when UTC is used is not limited to military use; it is used elsewhere too. This is often done whether or not there is a colon between the hours and minutes. --Zzo38 (talk) 04:22, 22 October 2018 (UTC)