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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". [34] E. G. Richards in his book Mapping Time (1999) provided a diagram in which 12 a.m. means noon and 12 p.m. means midnight. [35]
Noon (also known as noontime or midday) is 12 o'clock in the daytime. It is written as 12 noon, 12:00 m. (for meridiem, literally 12:00 midday), 12 p.m. (for post meridiem, literally "after midday"), 12 pm, or 12:00 (using a 24-hour clock) or 1200 (military time). Solar noon is the time when the Sun appears to contact the local celestial meridian.
The three-shift system is the most common plan for five 24-hour days per week. The "first shift" often runs from 06:00 to 14:00, "second shift" or "swing shift" from 14:00 to 22:00 and a "third shift" or "night shift" from 22:00 to 06:00, but shifts may also have different length to accommodate for workload, e.g. 7, 8 and 9 or 6, 8 and 10 hours.
The suffixes "a.m." and "p.m." (often represented as AM and PM) are appended universally in written language. Alternatively, people might specify "noon" or "midnight", after or instead of 12:00. (Business events, which are increasingly scheduled using groupware calendar applications, are less vulnerable to such ambiguity, since the software ...
Shift work increases the risk for the development of many disorders. Shift work sleep disorder is a circadian rhythm sleep disorder characterized by insomnia, excessive sleepiness, or both. Shift work is considered essential for the diagnosis. [9] The risk of diabetes mellitus type 2 is increased in shift workers, especially men. People working ...
When you're a kid, there's really no time early enough to open your presents on Christmas morning. But it turns out that opening your presents before breakfast apparently makes you seem "vulgar ...
AM and PM either don't apply to midnight and noon, or midnight is AM and noon is PM, not the other way around. Onlynone 03:58, 17 October 2007 (UTC) I think a mention of the fact that 'p.m.' is valid for times arbitrarily close to the notional "12:00", i.e. 12:00:00.0000001 should be included. --Random832 13:36, 4 December 2006 (UTC)
Example of U.S. TV dayparting: the beige area (2:00 – 6:00 am) is the overnight graveyard slot, considered significantly less important. A graveyard slot (or death slot) is a time period in which a television audience is very small compared to other times of the day, and therefore broadcast programming is considered far less important. [1]