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Six-hour clock at the Quirinal Palace, Rome The six-hour clock ( Italian : sistema orario a sei ore ), also called the Roman ( alla romana ) or the Italian ( all'italiana ) system, is a system of date and time notation in Italy which was invented before the modern 24-hour clock .
The order in which the year, month, and day are represented. (Year-month-day, day-month-year, and month-day-year are the common combinations.) How weeks are identified (see seven-day week) Whether written months are identified by name, by number (1–12), or by Roman numeral (I-XII). Whether the 24-hour clock, 12-hour clock, or 6-hour clock is ...
The daytime canonical hours of the Catholic Church take their names from the Roman clock: the prime, terce, sext and none occur during the first (prīma) = 6 am, third (tertia) = 9 am, sixth (sexta) = 12 pm, and ninth (nōna) = 3 pm, hours of the day. The English term noon is also derived from the ninth hour.
Date and time notation in Italy records the date using the day–month–year format (30 novembre 2024 or 30/11/2024). The time is written using the 24-hour clock (02:26); in spoken language and informal contexts the 12-hour clock is more commonly adopted, but without using "a.m." or "p.m." suffixes (2:26).
Writers have traditionally written abbreviated dates according to their local custom, creating all-numeric equivalents to day–month formats such as "11 December 2024" (11/12/24, 11/12/2024, 11-12-2024 or 11.12.2024) and month–day formats such as "December 11, 2024" (12/11/24 or 12/11/2024).
For example, the year cannot be divided into twelve 28-day months since 12 times 28 is 336, well short of 365. The lunar month (as defined by the moon's rotation) is not 28 days but 28.3 days. The year, defined in the Gregorian calendar as 365.2425 days has to be adjusted with leap days and leap seconds .
Italy alternates between Central European Time (Italian: Tempo dell'Europa Centrale, UTC+01:00) and Central European Summer Time (Italian: Orario Estivo dell'Europa Centrale, UTC+02:00), because it follows the European Summer Time annual Daylight saving time (Italian: ora legale) procedure.
This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...