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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 calendar relies on the Gregorian calendar, which it augments, to define the new year day (Monday of week 01). As a result, extra weeks are spread across the 400-year cycle in a complex, seemingly random pattern.
For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday. The formula is w = (d + m + y + c) mod 7.
ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data.It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]
The Javanese calendar contains multiple, overlapping (but separate) measurements of times, called "cycles". These include: the native five-day week, called Pasaran; the common Gregorian and Islamic seven-day week; the Solar month, called Mangsa; the Lunar month, called Wulan; the lunar year, or Tahun; the octo-ennia (8 year) cycles, or Windu
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This would mean that in a leap year, 28 June on the International Fixed Calendar would correspond to 16 June on the Gregorian Calendar. Therefore the following day, Leap Day, 29 June on the International Fixed Calendar, which only occurs in leap years, must be 17 June on the Gregorian Calendar, and not 18 June as noted in the chart.