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The need to correct the calendar arose from the realisation that the correct figure for the number of days in a year is not 365.25 (365 days 6 hours) as assumed by the Julian calendar but slightly less (c. 365.242 days). The Julian calendar therefore has too many leap years.
The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.
Within these tables, January 1 is always the first day of the year. The Gregorian calendar did not exist before October 15, 1582. Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon backward from October 15, 1582. Years are given in astronomical year numbering.
The ROC calendar follows the tradition of using the sovereign's era name and year of reign, as did previous dynasties of China. Months and days are numbered according to the Gregorian calendar. The ROC calendar has been in wide use in the ROC since 1912, including in early official documents. The ROC calendar is the official calendar used in ...
Relationship between the current Sexagenary cycle and Gregorian calendar. This Chinese calendar correspondence table shows the stem/branch year names, correspondences to the Western calendar, and other related information for the current, 79th sexagenary cycle of the Chinese calendar based on the 2697 BC epoch or the 78th cycle if using the 2637 BC epoch.
Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit year, e.g. 2024; m – one-digit month for months below 10, e.g. 3; mm – two-digit month, e.g. 03; mmm – three-letter abbreviation for ...
The calendar's epoch (first year) corresponds to the Hijrah in 622 CE, which is the same as the epoch of the Lunar Hijri calendar but as it is a solar calendar, the two calendars' year numbers do not coincide with each other and are slowly drifting apart, being about 43 years apart as of 2023.
The Soviet calendar was a modified Gregorian calendar that was used in Soviet Russia between 1918 and 1940. Several variations were used during that time. The Gregorian calendar, under the name "Western European calendar", was implemented in Soviet Russia in February 1918 by dropping the Julian dates of 1–13 February 1918.