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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 ...
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.
3.4 Highlight a week, a day of the week, or a day, or a date, or hide display of the week column. 3.5 ...
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 ISO year is slightly offset to the Gregorian year; for example, Monday 30 December 2019 in the Gregorian calendar is the first day of week 1 of 2020 in the ISO calendar, and is written as 2020-W01-1 or 2020W011.
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.
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The day is normally between 1 and 31. The Julian day number (which is the integer part of the Julian day plus one) modulo 7 grows from 0 (on Monday at noon) to 6 (on Sunday at noon) and returns to 0 the next day on Monday at noon (however this template ignores time, so this number is valid for the whole day from zero o'clock to midnight).