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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. For example, the Gregorian date Friday, 21 February 2025 corresponds to day number 5 in the week number 08 of ...
If Monday is the first day of the week, the days may be coded 1 to 7, for Monday through Sunday, as is practiced in ISO 8601. The day designated with 7 may also be counted as 0 , by applying the arithmetic modulo 7, which calculates the remainder of a number after division by 7.
the week with the first business day in the starting year (considering that Saturdays, Sundays and 1 January are non-working days), the week with the starting year's first Thursday in it (the formal ISO definition), the week with 4 January in it, the first week with the majority (four or more) of its days in the starting year, and; 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 16 February 2025 is 2460723.
Weeks are generally referred to by the date of some day within that week (e.g., "the week of May 25"), rather than by a week number. Many holidays and observances are identified relative to the day of the week on which they are fixed, either from the beginning of the month (first, second, etc.) or end (last, and far more rarely penultimate and ...
GPS dates are expressed as a week number and a day-of-week number, with the week number transmitted as a ten-bit value. This means that every 1,024 weeks (about 19.6 years) after Sunday 6 January 1980, (the GPS epoch ), the date resets again to that date; this happened for the first time at 23:59:47 on 21 August 1999, [ 11 ] the second time at ...
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Weeks are generally referred to by the date on which they start, with Monday often treated as the first day of the week, for example "the week commencing 5 March". [citation needed] Some more traditional calendars instead treat Sunday as the first day of the week. ISO 8601 week numbers are found in diaries and are used in business.