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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"). [1] [2] Each period consists of 12 hours numbered: 12 (acting as 0), [3] 1, 2, 3, 4
Whether the 24-hour clock, 12-hour clock, or 6-hour clock is used. Whether the minutes (or fraction of an hour) after the previous hour or until the following hour is used in spoken language. The punctuation used to separate elements in all-numeric dates and times. Which days are considered the weekend.
As in English, the clock face is also split into four quarters: times exactly on the hour are expressed using en punto ("o'clock"); "quarter past" or "quarter after" is expressed using the phrase y cuarto; a time thirty minutes past the hour is expressed using the phrase y media ("half past" or "-thirty"); and a time 15 minutes before the hour ...
The English term noon is also derived from the ninth hour. This was a period of prayer initially held at three in the afternoon but eventually moved back to midday for unknown reasons. [12] The change of meaning was complete by around 1300. [13] The terms a.m. and p.m. are still used in the 12-hour clock, as opposed to the 24-hour clock.
The Romans originally counted the morning hours backwards: "3 a. m." or "3 hours ante meridiem" meant "three hours before noon", in contrast to the modern meaning "three hours after midnight". This ancient division has survived in the Liturgy of the Hours : Prime , Terce , Sext , and Nones are named after the first, third, sixth and ninth hours ...
The time of day is typically expressed in English in terms of hours. Whole hours on a 12-hour clock are expressed using the contracted phrase o'clock, from the older of the clock. [6] (10 am and 10 pm are both read as "ten o'clock".) Hours on a 24-hour clock ("military time") are expressed as "hundred" or "hundred hours".
The Canary Islands then used a time 1 hour behind the rest of Spain; UTC−01:00, until 16 March 1940, and since then, they have used Western European Time (UTC±00:00). It is very popular in Spanish national media, mainly on the radio and television, to mention the phrase "una hora menos en Canarias" (English: "one hour less in the Canary ...
This property also makes it straightforward to represent a timestamp as a fractional day, so that 2024-12-10.54321 can be interpreted as five decimal hours, 43 decimal minutes and 21 decimal seconds after the start of that day, or a fraction of 0.54321 (54.321%) through that day (which is shortly after traditional 13:00).