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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.
Wednesday is sometimes informally referred to as "hump day" in North America, a reference to the fact that Wednesday is the middle day—or "hump"—of a typical work week. [ 5 ] [ 6 ] Lillördag , or "little Saturday", is a Nordic tradition of turning Wednesday evening into a small weekend-like celebration. [ 7 ]
The day of the week can be easily calculated given a date's Julian day number (JD, i.e. the integer value at noon UT): Adding one to the remainder after dividing the Julian day number by seven (JD modulo 7 + 1) yields that date's ISO 8601 day of the week. For example, the Julian day number of 6 March 2025 is 2460741.
Afrikaans; Alemannisch; Аԥсшәа; العربية; Aragonés; ܐܪܡܝܐ; Armãneashti; Arpetan; Asturianu; Azərbaycanca; বাংলা; Banjar; Башҡортса
Historically, the Greco-Roman week began with Sunday (dies solis), and Monday (dies lunae) was the second day of the week. [3] It is still the custom to refer to Monday as feria secunda in the liturgical calendar of the Catholic Church. Quakers also traditionally referred to Monday as "Second Day". [6]
For the 9-day week, the first day of the week is repeated 3 times in the first week of the 210-day Pawukon. The complexity of the calendar is increased by the calculations required to determine the arrangement of the days of the 1-, 2-, and 10-day weeks, which are not ordered in simple recurring 1, 2 and 10-day cycles.
Federal law defines a working week duration of 5 or 6 days with no more than 40 hours worked. In all cases Sunday is a holiday. With a 5-day working week the employer chooses which day of the week will be the second day off. Usually this is a Saturday, but in some organizations (mostly government), it is Monday.