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- Since noon is neither before noon nor after noon, a designation of either a.m. or p.m. is incorrect. Also, midnight is both twelve hours before noon and twelve hours after noon.
www.nist.gov/pml/time-and-frequency-division/times-day-faqsTimes of Day FAQs | NIST - National Institute of Standards ...
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Should I use AM or PM for noon and Midnight?
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The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday").
To avoid any confusion (and to make sure you arrive on time), it might be best to say 12 noon or 12 midnight instead. Alternatively, you could use the 24-hour clock system, where 12:00 is noon and 00:00 (or 24:00) is midnight.
Dec 9, 2010 · Midnight is written as "12am" which would imply that it's in the morning. Therefore, it should be at the start of the day. On the other hand, both Dictionary.com and the Oxford Dictionary define it as "twelve o'clock at night". Some examples: "Midnight on the 10th of December" "Midnight Thursday" "Midnight tonight" are usually interpreted as:
Mar 2, 2021 · Simply use the words “noon” and “midnight” instead of a.m. and p.m. On the 24-hour clock, both 00:00 and 24:00 indicate midnight. In informal usage, “12 o’clock” can be either noon or midnight.
May 4, 2012 · The question of whether midnight should be 12:00 a.m. or 12:00 p.m. is not inherently more confusing than whether midnight should be 00:00 or 24:00. In both cases, there is a convention, you learn it, and you move on.
Apr 13, 2017 · The day hasn't always started at midnight. Up to late 1805 the Royal Navy used three days: nautical, civil (or "natural"), and astronomical. A nautical day entered in a ship's log as 10 July, for example, in fact commenced at noon on 9 July civil reckoning, PM therefore coming before AM.
Mar 28, 2024 · Here’s what you need to know: Noon is 12 PM and midnight is 12 AM. Remember, AM stands for the Latin phrase ‘ante meridiem’ which means before midday. So, anything before noon is AM. PM stands for ‘post meridiem’ or after midday, making any time after noon PM.
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