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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]
Midnight is the transition time from one day to the next – the moment when the date changes, on the local official clock time for any particular jurisdiction. By clock time, midnight is the opposite of noon , differing from it by 12 hours.
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]
The symbolic clock now reads 89 seconds to midnight after advancing one second since last year's reset. It is now the closest to midnight since the introduction of the clock in 1947.
The Doomsday Clock, set at 89 seconds to midnight, is displayed before a news conference at the United States Institute of Peace, Tuesday, Jan. 28, in Washington.
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 ...
It has since been set backward 8 times and forward 18 times. The farthest time from midnight was 17 minutes in 1991, and the nearest is 89 seconds, set in January 2025. [5] The Clock was moved to 150 seconds (2 minutes, 30 seconds) in 2017, then forward to 2 minutes to midnight in 2018, and left unchanged in 2019. [6]
Midnight is known interchangeably as either "zero hundred" or "twenty four hundred", often chosen based on whether it is the start or end of a time range, respectively, though there are no times "higher" than 2400. [15]