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This eventually evolved into the two 12-hour periods which are used today, one called "a.m." starting at midnight and another called "p.m." starting at noon. Noon itself is rarely abbreviated today; but if it is, it is denoted "m." [1] The 12-hour clock can be traced back as far as Mesopotamia and ancient Egypt. [7]
This is indicated by the hours (and minutes) passed since midnight, from 00(:00) to 23(:59), with 24(:00) as an option to indicate the end of the day. This system, as opposed to the 12-hour clock, is the most commonly used time notation in the world today, [A] and is used by the international standard ISO 8601. [1]
Solar midnight depends on longitude and time of the year rather than on time zone. In ancient Roman timekeeping, midnight was halfway between dusk and dawn (i.e., solar midnight), varying according to the seasons. In some Slavic languages, "midnight" has an additional geographic association with "north" (as "noon" does with "south").
In January 2023, the Doomsday Clock was set at 90 seconds to midnight, the closest to midnight it has ever been, in large part because of the nuclear threat posed by Russia’s war on Ukraine.
Today, the Doomsday Clock was set to 89 seconds to midnight, the closest to midnight ever in its 78-year history. It’s the duty of the United States, China, and Russia to lead the world back ...
This corresponds to the time between 7:00 and 8:00 being the eighth hour of the day (the first hour starting at midnight). Russian uses the same convention: четверть восьмого (quarter of the eighth hour), полвосьмого (half of eight), без четверти восемь (eight without a quarter) meaning 7:15, 7:30, 7: ...
to use "12 noon" or "12 midnight" (though "12 midnight" may still present ambiguity regarding the specific date) to specify midnight as between two successive days or dates (as in "midnight Saturday/Sunday" or "midnight December 14/15") to avoid those specific times and to use "11:59 p.m." or "12:01 a.m." instead.
Atomic scientists on Tuesday moved their "Doomsday Clock" closer to midnight than ever before, citing Russian nuclear threats amid its invasion of Ukraine, tensions in other world hot spots ...