# 12:00 am/pm **URL:** \ **Category:** The BBQ Pit\ **Created:** [October 18, 2016, 6:55pm UTC](https://boards.straightdope.com/t/12-00-am-pm/768971 "2016-10-18T18:55:24Z")\ **Posts on this page:** 5\ **Page:** 3
**Author:** ![Bryan\_Ekers](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bryan_ekers/32/183_2.png) [@Bryan\_Ekers](https://boards.straightdope.com/u/Bryan_Ekers)\ **Post date:** [October 21, 2016, 1:53am UTC](https://boards.straightdope.com/t/12-00-am-pm/768971/41 "2016-10-21T01:53:08Z")
> [@pulykamell](#): > > I have seen 24:00 on train schedules and time tables in general before. It certainly is used. On a clock, though, you’ll always see 0:00. > > ETA: [Wikipedia actually has a sample image](https://en.wikipedia.org/wiki/24-hour_clock#/media/File:Railtime.jpg) of what I’m talking about. Huh. I find this vaguely annoying, like a typo in an advertisement. ---
**Author:** ![urban1a](https://avatars.discourse-cdn.com/v4/letter/u/e47c2d/32.png) [@urban1a](https://boards.straightdope.com/u/urban1a)\ **Post date:** [October 21, 2016, 2:11am UTC](https://boards.straightdope.com/t/12-00-am-pm/768971/42 "2016-10-21T02:11:03Z")
I have not figured out why having two 12:00 puzzles everyone so much. I think I have always known that one was noon and one was midnight. If it is something written, noon and midnight would tell you exactly what part of the day was being referred to. Of course, the other hours have to be qualified with AM/PM so maybe 24 hour time would be best, and everyone gets to buy a new clock or watch and junk those lovely long case grandfather clocks. And the convenience chain would be 0700/2300 (oh thank heaven). Bob ---
**Author:** ![watchwolf49](https://avatars.discourse-cdn.com/v4/letter/w/e9c0ed/32.png) [@watchwolf49](https://boards.straightdope.com/u/watchwolf49)\ **Post date:** [October 21, 2016, 7:22am UTC](https://boards.straightdope.com/t/12-00-am-pm/768971/43 "2016-10-21T07:22:50Z")
Maybe get a app for their smart phone with a tile showing whether it’s day or night. 1700 shadow … ---
**Author:** ![Richard\_Pearse](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/richard_pearse/32/13144_2.png) [@Richard\_Pearse](https://boards.straightdope.com/u/Richard_Pearse)\ **Post date:** [October 21, 2016, 9:04am UTC](https://boards.straightdope.com/t/12-00-am-pm/768971/44 "2016-10-21T09:04:29Z")
> [@Bryan Ekers](#): > > There is no 2400, by definition. It’s like saying 11:59 is followed by 11:60. You occasionally see 2400 used for midnight in aviation. The convention is that 2400 is the end of the day and 0000 is the start of the day. In the following weather forecast the bolded section refers to intermittent changes between the hours of 1400 and 2400 on the 21st of the month (the minutes are not included). If the period _started_ at midnight they would have used 0000, e.g., INTER 2100/2112. > [@](#): > > TAF AMD YSSY 202318Z 2100/2206 03020G30KT 9999 FEW040 > FM210900 01012KT 9999 SCT035 > FM211400 36010KT 9999 -RA FEW010 SCT030 BKN060 > FM212000 18020G30KT 9999 -SHRA FEW010 BKN020 > FM220200 20020G30KT 9999 -SHRA SCT030 > **INTER 2114/2124 5000 RA BKN010** > RMK > FM211400 MOD TURB BLW 5000FT T 24 26 25 23 Q 1017 1013 1011 1011 ---
**Author:** ![Filbert](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/filbert/32/3433_2.png) [@Filbert](https://boards.straightdope.com/u/Filbert)\ **Post date:** [October 21, 2016, 9:16am UTC](https://boards.straightdope.com/t/12-00-am-pm/768971/45 "2016-10-21T09:16:01Z")
> [@Chronos](#): > > At any moment during daylight hours when the clock is displaying 12:00, it is PM, and at any moment during nighttime hours when the clock is displaying 12:00, it is AM. Dependswherw you are, if you’re camping in the Orkney Isles at midsummer with only a 12hr wristwatch, it’s possible to miss the ferry by 12 hours without noticing anything more than that the town seems very quiet for 5 in the afternoon. Just ask my parents 😃 [Previous page](https://boards.straightdope.com/t/12-00-am-pm/768971.md?page=2)