is a good idea, especially legal documents such as contracts and insurance policies. To avoid ambiguity, specification of an event as occurring on a particular day at 11:59 p.m. However, if a date/time is referred to as "at midnight on Friday, October 20th" the intention could be either midnight the beginning of the day or midnight at the end of the day. When someone refers to "midnight tonight" or "midnight last night" the reference of time is obvious. Is midnight the end of a day or the beginning of a day? Hours of operation for a business or other references to a block of time should also follow this designation rule.įor example, a business might be open on Saturdays from 8 a.m. The same is true for midnight, but there is an added issue of which day midnight refers to (see below). as soon as it the 12:00 appears, and not delay the display of the p.m. For example, it would be applicable for a digital clock changing from 11:59:59 a.m. It is fair to say, however, that the shortest measurable duration after noon should be designated as p.m. Also, midnight is both twelve hours before noon and twelve hours after noon. Since noon is neither before noon nor after noon, a designation of either a.m. To illustrate this, consider that "a.m." and "p.m." are abbreviations for "ante meridiem" and "post meridiem," which mean "before noon" and "after noon," respectively. This is a tricky question because 12 a.m.
Are noon and midnight referred to as 12 a.m.Sunrise/sunset times and definitions of dusk/dawn/twilight.
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