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The last week of the ISO week-numbering year, i.e. W52 or W53, is the week before W01 of the next year. This week's properties are: It has the year's last Thursday in it. It is the last week with a majority (4 or more) of its days in December. Its middle day, Thursday, falls in the ending year. Its last day is the Sunday nearest to 31 December.
The ancient Etruscans developed an eight-day market week known as the nundinum around the 8th or 7th century BC. This was passed on to the Romans no later than the 6th century BC. As Rome expanded, it encountered the seven-day week and for a time attempted to include both. The popularity of the seven-day rhythm won, and the eight-day week ...
Companies in Europe often use year, week number, and day for planning purposes. So, for example, an event in a project can happen on w43 (week 43) or w43-1 (Monday, week 43) or, if the year needs to be indicated, on w0643 (the year 2006, week 43; i.e., Monday 23 October–Sunday 29 October 2006). An ISO week-numbering year has 52 or 53 full ...
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 2 February 2025 is 2460709.
Similarly, the last ISO week of a year may have up to three days that are actually in the Gregorian calendar year that is starting; if three, they are Friday, Saturday, and Sunday. The Thursday of each ISO week is always in the Gregorian calendar year denoted by the ISO week-numbering year. Examples: Monday 29 December 2008 is written "2009-W01-1"
A fragment of the Fasti Praenestini for the month of Aprilis, showing its nundinal letters on the left side The full remains of the Fasti Praenestini. The nundinae (/ n ə n ˈ d ɪ n aɪ /, /-n iː /), sometimes anglicized to nundines, [1] were the market days of the ancient Roman calendar, forming a kind of weekend including, for a certain period, rest from work for the ruling class ().
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The returned value is ordered from 0 to 6 according to the ISO week (Monday to Sunday), and is consistent with date computing with Julian day, ISO week or ISO year computations. Use another template to convert it to traditional US week numbers, by adding 5, reducing the result with modulo 7 and, if needed, adding 1 to the result for a range ...