<Li> ^ Jump up to: NIST recommends using 11: 59 p.m. and 12: 01 a.m. to disambiguate when needed . </Li> <P> It is not always clear what times "12: 00 a.m." and "12: 00 p.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 . Although "12 m ." was suggested as a way to indicate noon, this is seldom done and also does not resolve the question of how to indicate midnight . </P> <P> The American Heritage Dictionary of the English Language states "By convention, 12 AM denotes midnight and 12 PM denotes noon . Because of the potential for confusion, it is advisable to use 12 noon and 12 midnight ." </P> <P> E.G. Richards in his book Mapping Time provided a diagram in which 12 a.m. means noon and 12 p.m. means midnight . The style manual of the United States Government Printing Office used 12 a.m. for noon and 12 p.m. for midnight until its 2008 edition, when it reversed these designations, later maintained in its 2016 revision . </P>

Is 12 am in the morning or night
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