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  2. Determination of the day of the week - Wikipedia

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

    The Rata Die method works by adding up the number of days d that has passed since a date of known day of the week D. The day of-the-week is then given by (D + d) mod 7, conforming to whatever convention was used to encode D. For example, the date of 13 August 2009 is 733632 days from 1 January AD 1. Taking the number mod 7 yields 4, hence a ...

  3. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Applying the Doomsday algorithm involves three steps: determination of the anchor day for the century, calculation of the anchor day for the year from the one for the century, and selection of the closest date out of those that always fall on the doomsday, e.g., 4/4 and 6/6, and count of the number of days between that date and the date in ...

  4. Template:Age in days - Wikipedia

    en.wikipedia.org/wiki/Template:Age_in_days

    This template returns the number of days between two dates. Dates may be input either as full dates or as year, month and day. Usage. Full dates. To use, type:

  5. Template:Days since - Wikipedia

    en.wikipedia.org/wiki/Template:Days_since

    This template is a facade for {{}} which invokes that template to specifically return an integer of the amount of days since a given timestamp. {{}} is a larger template, with many more options, that can be used for more customized output.

  6. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    Subtract the weekday number from the ordinal day of the year. Add 10. Divide by 7, discard the remainder. If the week number thus obtained equals 0, it means that the given date belongs to the preceding (week-based) year. If a week number of 53 is obtained, one must check that the date is not actually in week 1 of the following year. Formula

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

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

    This template returns the number of full years, surplus months, and surplus days between two specified dates. If the second set of parameters is not included, it will return the number of years, months and days between a specified date and today's date. Template parameters [Edit template data] Parameter Description Type Status Year ('from' date) 1 year The year of the (first) date Number ...

  8. Unix time - Wikipedia

    en.wikipedia.org/wiki/Unix_time

    A Unix time number is easily converted back into a UTC time by taking the quotient and modulus of the Unix time number, modulo 86 400. The quotient is the number of days since the epoch, and the modulus is the number of seconds since midnight UTC on that day.

  9. Perfect month - Wikipedia

    en.wikipedia.org/wiki/Perfect_month

    A perfect month or a rectangular month designates a month whose number of days is divisible by the number of days in a week and whose first day corresponds to the first day of the week. [1] [2] This causes the arrangement of the days of the month to resemble a rectangle.