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  2. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    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 Thursday, 8 August 2024 corresponds to day number 4 in the week number 32 of ...

  3. Template:Age in years, months, weeks and days - Wikipedia

    en.wikipedia.org/wiki/Template:Age_in_years...

    Note that all parameters default to the current date, so for example, the second set of parameters can be left out to calculate elapsed time since a past date: { {Age in years, months, weeks and days |month1 = 1 |day1 = 1 |year1 = 1 }} → 2022 years, 10 months, 3 weeks and 5 days. Or simply, using the simpler parameter names, compatible with ...

  4. 4–4–5 calendar - Wikipedia

    en.wikipedia.org/wiki/4–4–5_calendar

    The 4–4–5 calendar is a method of managing accounting periods, and is a common calendar structure for some industries such as retail and manufacturing. It divides a year into four quarters of 13 weeks, each grouped into two 4-week "months" and one 5-week "month". The longer "month" may be set as the first (5–4–4), second (4–5–4), or ...

  5. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    ISO 8601 is an international standard covering the worldwide exchange and communication of date and time -related data. It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1] The standard provides a well-defined ...

  6. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future. For the Gregorian and Julian calendars, a perpetual calendar typically consists of one of three general variations: Fourteen one-year calendars, plus a table to show which one-year calendar is to be ...

  7. Template:Age in weeks - Wikipedia

    en.wikipedia.org/wiki/Template:Age_in_weeks

    Template documentation. This template returns the number of weeks that have elapsed between two dates. If the second set of parameters is not included it will automatically calculate the days between a given date and today. Each date can be entered in a single parameter, or each date can be entered as three parameters: year, month, day.

  8. Year 1900 problem - Wikipedia

    en.wikipedia.org/wiki/Year_1900_problem

    Microsoft Excel (using the default 1900 Date System) cannot display dates before the year 1900, although this is not due to a two-digit integer being used to represent the year: Excel uses a floating-point number to store dates and times. The number 1.0 represents the first second of January 1, 1900, in the 1900 Date System (or January 2, 1904 ...

  9. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.

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