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An hour of syndicated programming time (between 7:00 and 8:00 p.m. in the Eastern and Pacific time zones) is lost in the Central and Mountain time zones since network primetime in those areas starts at 7:00 p.m., forcing stations in Mountain or Central time (or in parts of both zones) to choose between airing their 6:00 p.m. newscast and ...
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]
In traditional American usage, dates are written in the month–day–year order (e.g. February 23, 2025) with a comma before and after the year if it is not at the end of a sentence [2] and time in 12-hour notation (4:14 am). International date and time formats typically follow the ISO 8601 format (2025-02-23) for all-numeric dates, [3] write ...
Nationwide daylight saving time was repealed in 1919, though states and cities still had the option to enact it for themselves, leading to a patchwork of time zones across the country until the ...
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Every digital clock that uses am/pm assumes that 12:00 am is midnight and 12:00 pm is noon. It is the de facto convention, and rightly so. I have seen increasing use of 12:00 pm in signs and notices and such to mean noon and never the other way around. The American Heritage dictionary says 12:00 am is midnight and 12:00 pm is noon.
Before the adoption of four standard time zones for the continental United States, many towns and cities set their clocks to noon when the sun passed their local meridian, pre-corrected for the equation of time on the date of observation, to form local mean solar time. Noon occurred at different times but time differences between distant ...
As the source and comment above show, the convention used in TV, radio, etc that uses 0 PM for noon follows "how it's taught in school" and is actually a logical extension of the legal one that uses 0 AM (午前0時) for midnight but 12 AM (午前12時) for noon (although at least one regulation exists that used 午後零時, i.e. 0 PM; see ja ...