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  2. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    February's 28 or 29 days is a problem, so the formula rolls January and February around to the end so February's short count will not cause a problem. The formula is interested in days of the week, so the numbers in the sequence can be taken modulo 7.

  3. February 21 - Wikipedia

    en.wikipedia.org/wiki/February_21

    Download QR code; Print/export ... February 21 is the 52nd day of the year in the Gregorian calendar; 313 days remain until the end of the year ...

  4. Template:ISOCALENDAR/day - Wikipedia

    en.wikipedia.org/wiki/Template:ISOCALENDAR/day

    By default the current day is highlighted. To highlight (an)other day(s) use cw and cdow. cw gives the week and cdow the day of the week to be highlighted. Together they determine a specific day to be highlighted. cw alone will highlight the whole week. cdow alone will highlight the given week day for the whole month.

  5. Determination of the day of the week - Wikipedia

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

    For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday. The formula is w = (d + m + y + c) mod 7.

  6. Mark Your Calendar for Every February Holiday to Celebrate ...

    www.aol.com/mark-calendar-every-february-holiday...

    Here's a list of the February holidays and observances to know about in 2025. Valentine's Day, National Golden Retriever Day, and more make it on this list.

  7. Add these 2024 February holidays and observances to your ...

    www.aol.com/news/full-list-february-holidays...

    Presidents’ Day. World Day for Social Justice. February 21. Language Day. National Grain Free Day. National Sticky Bun Day. February 22. Be Humble Day. National Chili Day. National Cook a Sweet ...

  8. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    To find which day of the week Christmas Day of 2021 is, proceed as follows: in the year 2021, doomsday is on Sunday. Since December 12 is a doomsday, December 25, being thirteen days afterwards (two weeks less a day), fell on a Saturday. Christmas Day is always the day of the week before doomsday.

  9. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    27 week years are 5 days longer than the month years (371 − 366), 6.75%. 44 week years are 6 days longer than the month years (371 − 365), 11%. 70 week years are 2 days shorter than the month years (364 − 366), 17.5%. 259 week years are 1 day shorter than the month years (364 − 365), 64.75%. The table shows the long years in a 400-year ...