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The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.
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.
365-day calendar used for accounting. Unix time, number of seconds elapsed since 1 January 1970, 00:00:00 (UTC). Julian day, number of days elapsed since 1 January 4713 BC, 12:00:00 (UTC). Heliocentric Julian Date, Julian day corrected for differences in the Earth's position with respect to the Sun.
The Calendar of the Church Year is the liturgical calendar found in the 1979 Book of Common Prayer and in Lesser Feasts and Fasts, with additions made at recent General Conventions. The veneration of saints in the Episcopal Church (United States) is a continuation of an ancient tradition from the early Church which honors important and ...
May 21: World Day for Cultural Diversity for Dialogue and Development. 1138 – The Crusades: The siege of Shaizar ended, and the Emir of Shaizar became a vassal of the Byzantine Empire. 1864 – American Civil War: The inconclusive Battle of Spotsylvania Court House in Virginia ended with combined Union and Confederate casualties totaling ...
Juneteenth National Independence Day. Independence Day. Labor Day. Columbus Day. Veterans Day. Thanksgiving Day. Christmas Day. Federal holidays in the United States are 11 calendar dates designated by the U.S. federal government as holidays. On these days non-essential U.S. federal government offices are closed and federal employees are paid ...
2026 date. May 10. ( 2026-05-10) Frequency. Annual. Related to. Father's Day. Mother's Day is an annual holiday celebrated in the United States on the second Sunday in May. Mother's Day recognizes mothers, motherhood and maternal bonds in general, as well as their positive contributions to their families and society.
All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. 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 ...