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The Babylonians invented the actual [clarification needed] seven-day week in 600 BCE, with Emperor Constantine making the Day of the Sun (dies Solis, "Sunday") a legal holiday centuries later. [2] In the international standard ISO 8601, Monday is treated as the first day of the week, but in many countries it is counted as the second day of the ...
The ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time standard issued by the International Organization for Standardization (ISO) since 1988 (last revised in 2019) and, before that, it was defined in ISO (R) 2015 since 1971.
Day of Arafah is an Islamic holiday that falls on the 9th day of Dhu al-Hijjah of the lunar Islamic Calendar. It is the holiest day in the Islamic calendar (the holiest night being The Night of Power), the second day of the Hajj pilgrimage, and the day after is the first day of the major Islamic holiday of Eid al-Adha. Judaism
The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.
Singles Awareness Day (15 February) International Pipe Smoking Day (20 February) Star Wars Day (4 May) "May the Fourth be with you" Super Bowl Sunday (day of the National Football League championship) Sweetest Day (third Saturday in October) Tax Freedom Day; Towel Day (25 May) (tribute to the author Douglas Adams) White Day (14 March) World ...
International Lamington Day [10] July 22 Pi Approximation Day (22/7 in the day/month date format) First Friday of August International Beer Day: 2007 October 1 International Coffee Day: 2015 [11] World Sake Day: 2007 World Vegetarian Day: 1977, North American Vegetarian Society [citation needed] October 10 World Porridge Day: 2009 [12] [13] [14 ...
The three months in each quarter have 31, 30, and 30 days respectively. Each quarter begins with the 31-day months of January, April, July, or October. The World Calendar also has the following two additional days to maintain the same new year days as the Gregorian calendar. Worldsday The last day of the year following Saturday 30 December.
11 March - International Day for Digital Learning [11] 14 March - International Day of Mathematics [12] 20 March - International Francophonie Day [13] 21 March - World Poetry Day [14] 21 March - International Day for the Elimination of Racial Discrimination [15] 21 March - International Day of Nowruz [16] 22 March - World Water Day [17]