What do a.m. and p.m. stand for?

calendar day

the period from one midnight to the following midnight.
Origin of calendar day
1840-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for calendar day
  • Your benefits will be available on the calendar day of the month that matches the last digit of your case number.
  • The public is required to restrict lawn watering to every other day based on address and calendar day.
  • By the beginning of the first regularly scheduled work day that would fall eight hours after the end of the calendar day.
British Dictionary definitions for calendar day

calendar day

See day (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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