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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").
Western European Summer Time / British Summer Time / Irish Standard Time : Red: Central European Time ... a hyphen is used (e.g. "12–21" for noon till 9 pm). [61]
(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 .
24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of ...
During the experiment of 1968 to 1971, when the British Isles did not revert to Greenwich Mean Time during the winter, the all-year British Summer Time was called British Standard Time (BST). In the UK, UTC+00:00 is disseminated to the general public in winter and UTC+01:00 in summer. [5] [18]
Since 1997, most of the European Union aligned with the British standards for BST. In 1968 [ 23 ] there was a three-year experiment called British Standard Time , when the UK and Ireland experimentally employed British Summer Time (GMT+1) all year round; clocks were put forward in March 1968 and not put back until October 1971.
UTC−12:00: blue (December), orange (June), yellow (year-round), light blue (sea areas) UTC−12:00 is an identifier for a time offset from UTC of −12:00. It is the last to enter a New Year, and is sometimes referred to as the International Date Line West (IDLW) time zone.
The nighttime cycle begins at dusk 12:00 (6:00:00 PM EAT) and ends at dawn at 11:59:59 (5:59:59 AM EAT). The convention is that the day begins at 1:00 o'clock in the morning according to the 12-hour cycle (7:00 AM EAT) rather than midnight (12:00 AM EAT). [ 5 ]