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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 ...
Afrikaans; Alemannisch; Аԥсшәа; العربية; Aragonés; ܐܪܡܝܐ; Armãneashti; Arpetan; Asturianu; Azərbaycanca; বাংলা; Banjar; Башҡортса
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.
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]
In Islamic countries, Fridays are considered as the last or penultimate day of the week and are holidays along with Thursdays or Saturdays; Saturday is called سبت, Sabt (cognate to Sabbath) and it is the first day of the week in many Arab countries but the Last Day in other Islamic countries such as Indonesia, Malaysia, Brunei, Central Asian ...
In some Muslim countries, Saturday is the first day of the week and thus Tuesday is the fourth day of the week. The English name is derived from Middle English Tewesday , from Old English Tiwesdæg meaning "Tīw's Day", the day of Tiw or Týr , the god of single combat , law, and justice in Norse mythology .
Thursday is the day of the week between Wednesday and Friday. According to the ISO 8601 international standard, it is the fourth day of the week. [ 1 ] In countries which adopt the "Sunday-first" convention, it is the fifth day of the week.
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 10 February 2025 is 2460717.