ante meridiem and post meridiem

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MsNyree

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What is the correct way to write ante meridiem and post meridiem? I see 3p.m. and 3pm. Are both ways correct? I just want to be sure which way is the correct way to write.
 

billmcd

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Use the periods (.) with or without caps. I prefer caps.
 

bhaisahab

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Raymott

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You might notice that even the greenwichmeantime site gets it wrong some of the time:
"It is after Noon that P.M. starts e.g. 00:00:01 PM (12:00:01)"
They are also inconsistent with capitals:
"Abbreviation a.m."
"Abbreviation p.m."
 

2006

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You might notice that even the greenwichmeantime site gets it wrong some of the time:
"It is after Noon that P.M. starts e.g. 00:00:01 PM (12:00:01)"
They are also inconsistent with capitals:
"Abbreviation a.m."
"Abbreviation p.m."
Actually p.m. starts at exactly 12 noon and a.m. starts at exactly 12 midnight. There is no time that isn't either a.m. or p.m.
 
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