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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 ".
Solar midnight is the time opposite to solar noon, when the Sun is closest to the nadir, and the night is equidistant from sunset and sunrise. Due to the advent of time zones , which regularize time across a range of meridians , and daylight saving time , solar midnight rarely coincides with 12 midnight on the clock.
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.
What about noon and midnight? ... Not to mention it would probably be even more confusing if time went from 12:00 PM to 12:01 AM. So noon then becomes 12 PM by default.
There are twelve hours in a half day, numbered one to twelve for both the ante meridiem (a.m.) and the post meridiem (p.m.). 12:00 p.m. is midday or noon, and 12:00 a.m. is midnight. The basic units of time (60 seconds, 60 minutes, 24 hours) are evenly divisible by twelve into smaller units.
To suggest that midnight is part of Saturday makes it nonsensical to say "midnight on Saturday" when you mean by midnight at the end of Friday. So 12 midnight is part of the day that it is at the end of. And it is after midday hence post meridiem so midnight is 12pm. And therefore noon is 12am. Simple. Marlarkey 23:59, 9 October 2024 (UTC)
Usually, use noon and midnight rather than 12 pm and 12 am; whether "midnight" refers to the start or the end of a date should be explicitly specified unless clear from the context. Where several times that are all a.m. or all p.m. appear in close proximity, then a.m. or p.m. need be given only once if there is no risk of confusion.
Because of the calendar, Social Security recipients who get Supplemental Security Income benefits get their first 2025 check on Dec. 31, 2024.