The 24-hour analog dial was reserved for more specialized applications, such as,Most analog clocks and watches today use the 12-hour dial, on which the shorter hour hand rotates once every 12 hours and twice in one day. 12 midnight is AM. it is the same for 12:00 noon. For example, if one commutes to work at "9:00", 9:00 a.m. may be implied, but if a,The terms "a.m." and "p.m." are abbreviations of the Latin.Some stylebooks suggest the use of a space between the number and the a.m. or p.m. abbreviation.In speaking, it is common to round the time to the nearest five minutes and/or express the time as the past (or to) the closest hour; for example, "five past five" (5:05). E. G. Richards in his book Mapping Time provided a diagram in which 12 a.m. means noon and 12 p.m. means midnight. Every day starts precisely at midnight and A.M. starts immediately after that point in time e.g. Therefore 24:00 Sunday or 00:00 Monday are both midnight meaning Sunday to Monday.It is common for transport timetables to use 23:59 Sunday or 00:01 Monday, or 11:59 pm or 12:01 am, to further reduce confusion.There are no standards established for the meaning of 12am and 12pm. For the o'clock watch, see.These styles are ambiguous with respect to whether midnight is at the start or end of each day.NIST recommends using 11:59 p.m. and 12:01 a.m. to disambiguate when needed.Hacker, Diana, A Writer's Reference, six edition, Bedford, St Martin's, Boston, 2007, section M4-c, p.308.Paula Froke, Anna Joe Bratton, Oskar Garcia, Jeff McMillan & Jerry Schwart, Eds., 54th ed.,Last edited on 11 September 2020, at 15:01,The American Heritage Dictionary of the English Language,"Berlin instruments of the old Eg.time of day destination",National Library of Australia catalogue entry,"How to customize how the time is displayed in Windows","United States Government Printing Office Style Manual","U.S. Government Printing Office Style Manual",National Institute of Information and Communications Technology,https://en.wikipedia.org/w/index.php?title=12-hour_clock&oldid=977882385,Creative Commons Attribution-ShareAlike License. PM stands for Prime Meridian. We use cookies to ensure that we give you the best experience on our website,There is no confusion when using the words 12 noon (or midday) and 12 midnight, although the use of 12 midnight can raise the questions.To avoid confusion, it is always better to use the 24-hour clock, so that 12:00 is 12 noon. The 12-hour clock was used throughout the British empire.During the 15th and 16th centuries, the 12-hour analog dial and time system gradually became established as standard throughout Northern Europe for general public use. Midnight and Noon "12 AM" and "12 PM" can cause confusion, so we prefer "12 Midnight" and "12 Noon". 12:00 midnight is AM (After Midnight), and 12:00 noon is PM (Prior [to] Midnight), based upon a … Every day starts precisely at midnight and AM starts immediately after that point in time e.g. For an example of the latter method, "midnight" is replaced with "11:59 p.m." for the end of a day or "12:01 a.m." for the start of a day. PM stands for Post Meridian, which is Latin for: after midday At 12 o'clock it is neither before midday nor after midday (midday stands for middle point, not really "day"). 00:00:01 AM (see also leap seconds) To avoid confusion timetables, when scheduling around midnight, prefer to use either 23:59 or 00:01 to avoid confusion as to which day is being referred to. 12:00 midnight is not am or pm.