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  2. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    The overall function, , normalizes the result to reside in the range of 0 to 6, which yields the index of the correct day of the week for the date being analyzed. The reason that the formula differs between calendars is that the Julian calendar does not have a separate rule for leap centuries and is offset from the Gregorian calendar by a fixed ...

  3. 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.

  4. Time formatting and storage bugs - Wikipedia

    en.wikipedia.org/wiki/Time_formatting_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 ...

  5. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    For example, the Gregorian date Tuesday, 21 January 2025 corresponds to day number 2 in the week number 04 of 2025, and is written as 2025-W04-2 (in extended form) or 2025W042 (in compact form). The ISO year is slightly offset to the Gregorian year; for example, Monday 30 December 2019 in the Gregorian calendar is the first day of week 1 of ...

  6. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    [82] [83] Thus, a formula counting dates between (for example) February 1, 1900 and March 1, 1900 will return an incorrect result. The bug originated from Lotus 1-2-3 , where it was deliberately implemented to save computer memory, and was also intentionally implemented in Excel for the purpose of bug compatibility . [ 84 ]

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    I'm a Financial Advisor: My Wealthiest Clients All Do These 3 Things 3 Things You Must Do When Your Savings Reach $50,000 Meet Your Money Goals: The Best Banks of 2025

  8. NFL playoff bold predictions: Who will turn heads in ...

    www.aol.com/nfl-playoff-bold-predictions-turn...

    The opening week of the NFL playoffs ... (823), touchdowns (3) and yards per catch (8.5) while posting his fewest 100-yard games (1) in a decade. ... Head coach Dan Quinn has drilled his team for ...

  9. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    For determination of the day of the week (January 1, 2000, Saturday) the day of the month: 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.

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