Cheshunt/Enfield Town to London Liverpool Street via Seven Sisters service Interim train timetables" (PDF). Abellio Greater Anglia London. 17 May 2015. pp.7, 8. Archived from the original (PDF) on 26 May 2015. quarter". American Heritage Dictionary (3rded.). Boston: Houghton Mifflin. 1992. s.v. usage note at end of "quarter" entry.

Moreover, in situations where the relevant hour is obvious or has been recently mentioned, a speaker might omit the hour and just say "quarter to (the hour)", "half past" or "ten 'til" to avoid an elaborate sentence in informal conversations. These forms are often commonly used in television and radio broadcasts that cover multiple time zones at one-hour intervals. [21] AM in the 24-hour format is expressed as 00:30 because we subtract 12 hours from the time after 12 noon. Here, 12:30 - 12 = 00:30. It is to be noted that the hours and minutes remain the same from 1:00 AM to 11:59 AM. Is Noon AM or PM? AM". The American Heritage Dictionary of the English Language (Fifthed.). 2011. Archived from the original on 9 January 2014. a b Paula Froke, Anna Joe Bratton, Oskar Garcia, Jeff McMillan & Jerry Schwart, Eds., 54th ed., The Associated Press Stylebook and Briefing on Media Law, New York: Basic Books, June 2019, ISBN 978-1-5416-9989-2, s.v. noon, midnight, times. or 0PM?]. National Institute of Information and Communications Technology (in Japanese). 15 February 1989. Archived from the original on 6 June 2017 . Retrieved 24 May 2017.In older English, it was common for the number 25 to be expressed as "five-and-twenty". [18] In this way the time 8:35 may be phrased as "five-and-twenty to 9", [19] although this styling fell out of fashion in the later part of the 1900s and is now rarely used. [20] Some style guides suggest the use of a space between the number and the a.m. or p.m. abbreviation. [ citation needed] Style guides recommend not using a.m. and p.m. without a time preceding it. [15] GPO Style Manual. 2016. p.236". govinfo.gov. 12 January 2017. Archived from the original on 17 March 2018 . Retrieved 16 March 2018.

Richards, E. G. (1999). Mapping Time: the Calendar and its History. Oxford University Press. p.289. It is not always clear what times "12:00a.m." and "12:00p.m." denote. From the Latin words meridies (midday), ante (before) and post (after), the term ante meridiem (a.m.) means before midday and post meridiem (p.m.) means after midday. Since "noon" (midday, meridies (m.)) is neither before nor after itself, the terms a.m. and p.m. do not apply. [2] Although "12m." was suggested as a way to indicate noon, this is seldom done [27] and also does not resolve the question of how to indicate midnight. Berlin instruments of the old Eg.time of day destination". members.aon.at. Archived from the original on 15 November 2006 . Retrieved 13 June 2006. The terms "a.m." and "p.m." are abbreviations of the Latin ante meridiem (before midday) and post meridiem (after midday). Depending on the style guide referenced, the abbreviations "a.m." and "p.m." are variously written in small capitals (" am" and " pm"), [ citation needed] uppercase letters without a period ("AM" and "PM"), uppercase letters with periods, or lowercase letters ("am" and "pm" or, [13] "a.m." and "p.m."). [ citation needed] With the advent of computer generated and printed schedules, especially airlines, advertising, and television promotions, the "M" character is often omitted as providing no additional information as in "9:30A" or "10:00P". [14]The American Heritage Dictionary of the English Language states "By convention, 12AM denotes midnight and 12PM denotes noon. Because of the potential for confusion, it is advisable to use 12 noon and 12 midnight." [31] In Japanese usage, midnight is written as 午前0時 (0:00a.m.) and noon is written as 午後0時 (0:00p.m.), making the hours numbered sequentially from 0 to 11 in both halves of the day. This describes AM-AM conversion basics in PA, its cause and mention its effect on constellation point of modulated signal. Addington, Susan (25 August 2016). "Modular Arithmetic". Archived from the original on 4 July 2008 . Retrieved 28 November 2008. When abbreviations and phrases are omitted, one may rely on sentence context and societal norms to reduce ambiguity. For example, if one commutes to work at "9:00", 9:00a.m. may be implied, but if a social dance is scheduled to begin at "9:00", it may begin at 9:00p.m.