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  2. 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 ...

  3. Determination of the day of the week - Wikipedia

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

    Take the given date in 4 portions, viz. the number of centuries, the number of years over, the month, the day of the month. Compute the following 4 items, adding each, when found, to the total of the previous items. When an item or total exceeds 7, divide by 7, and keep the remainder only.

  4. Baháʼí calendar - Wikipedia

    en.wikipedia.org/wiki/Baháʼí_calendar

    The annual Nineteen Day Fast is held during the final month of ʻAláʼ. The month of fasting is followed by Naw-Rúz, the new year. The monthly Nineteen Day Feast is celebrated on the first day of each month, preferably starting any time between the sunset on the eve of the day to the sunset ending the day.

  5. List of observances set by the Baháʼí calendar - Wikipedia

    en.wikipedia.org/wiki/List_of_observances_set_by...

    It fell on March 20 from 2018 to 2021 and will fall on March 21 in 2022–2023. All Baha'i observances begin at the sundown prior to the date listed, and end at sundown of the date in question unless otherwise noted. The Birth of the Báb and Birth of Baháʼu'lláh fall on November 5–6 in 2021. [1]

  6. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    Alexander Jones says that the correct Julian calendar was in use in Egypt in 24 BC, [54] implying that the first day of the reform in both Egypt and Rome, 1 January 45 BC, was the Julian date 1 January if 45 BC was a leap year and 2 January if it was not. This necessitates fourteen leap days up to and including AD 8 if 45 BC was a leap year and ...

  7. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    Julian date Gregorian date Difference 1582: October 4: October 14: 10 1582: October 5: October 15: 10 1582: October 6: October 16: 10 1700: February 18: February 28: 10 1700: February 19: March 1: 11 1700: February 28: March 10: 11 1700: February 29: March 11: 11 1700: March 1: March 12: 11 1800: February 17: February 28: 11 1800: February 18 ...

  8. Buddhist calendar - Wikipedia

    en.wikipedia.org/wiki/Buddhist_calendar

    The days of the month are counted in two halves, waxing and waning. The 15th of the waxing is the civil full moon day. The civil new moon day is the last day of the month (14th or 15th waning). Because of the inaccuracy of the calendrical calculation systems, the mean and real (true) New Moons rarely coincide.

  9. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    Note: In this algorithm January and February are counted as months 13 and 14 of the previous year. E.g. if it is 2 February 2010 (02/02/2010 in DD/MM/YYYY), the algorithm counts the date as the second day of the fourteenth month of 2009 (02/14/2009 in DD/MM/YYYY format) So the adjusted year above is: