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[1] Historically, many units of time were defined by the movements of astronomical objects. Sun-based: the year is based on the Earth's orbital period around the sun. Historical year-based units include the Olympiad (four years), the lustrum (five years), the indiction (15 years), the decade, the century, and the millennium.
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.
This is an accepted version of this page This is the latest accepted revision, reviewed on 13 June 2024. Position of the year within the 19-year Metonic cycle Not to be confused with Golden ratio. Month of January from Calendarium Parisiense (fourth quarter of the 14th c.). The golden numbers, in the leftmost column, indicate the date of the new moon for each year in the 19-year cycle A golden ...
RFC 3339 Date and Time on the Internet: Timestamps specifies YYYY-MM-DD, i.e. a particular subset of the options allowed by ISO 8601. [10] RFC 5322 Internet Message Format specifies day month year where day is one or two digits, month is a three letter month abbreviation, and year is four digits. [11]
The months January to December are numbered 1 to 12. For the year, astronomical year numbering is used, thus 1 BC is 0, 2 BC is −1, and 4713 BC is −4712. JDN is the Julian Day Number. Use the previous day of the month if trying to find the JDN of an instant before midday UT.
A decimal calendar is a calendar which includes units of time based on the decimal system. For example, a "decimal month" would consist of a year with 10 months and 36.52422 days per month. For example, a "decimal month" would consist of a year with 10 months and 36.52422 days per month.
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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.