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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 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 16 December 2024 is 2460661.
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"
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 ...
Returns the ISO week day number (0=Monday..6=Sunday). This number is coherent with all the ISO-based calendar templates, including WEEKDAY, WEEKDAYNAME, and so on... This number is coherent with all the ISO-based calendar templates, including WEEKDAY, WEEKDAYNAME, and so on...
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The 2025 "No List" from the travel guide Fodor's highlights 15 places struggling with tourism, including Venice, Barcelona, and Koh Samui.
"A precise date is specified by the ISO week-numbering year in the format YYYY, a week number in the format ww prefixed by the letter 'W', and the weekday number, a digit d from 1 through 7, beginning with Monday and ending with Sunday." WRONG. Technically, Sunday is 0, not 7. Because 1 week is already 7 days and Base 7 doesn't have the number 7.