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  2. Hijri year - Wikipedia

    en.wikipedia.org/wiki/Hijri_year

    Given that the Islamic New Year does not begin January 1 and that a Hijri calendar year is about 11 days shorter than a Gregorian calendar year, [13] [c] there is no direct correspondence between years of the two eras. A given Hijri year will usually fall in two successive Gregorian years.

  3. Golden number (time) - Wikipedia

    en.wikipedia.org/wiki/Golden_number_(time)

    The golden number of any Julian or Gregorian calendar year can be calculated by dividing the year by 19, taking the remainder, and adding 1. (In mathematics this can be expressed as (year number modulo 19) + 1.) For example, 2025 divided by 19 gives 106, remainder 11. Adding 1 to the remainder gives a golden number of 12.

  4. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    This form is standard in East Asia, Iran, Lithuania, Hungary, and Sweden; and some other countries to a limited extent. Examples for the 9th of November 2003: 2003-11-09: the standard Internet date/time format, [ 2 ] a profile of the international standard ISO 8601 , orders the components of a date like this, and additionally uses leading zeros ...

  5. List of Islamic years - Wikipedia

    en.wikipedia.org/wiki/List_of_Islamic_years

    This is a list of Hijri years (Latin: anno Hegirae or AH) with the corresponding common era years where applicable. For Hijri years since 1297 AH (1879/1881 CE), the Gregorian date of 1 Muharram, the first day of the year in the Islamic calendar, is given.

  6. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    As an aside note, if we have a three-digit number abc, where a, b, and c are the digits, each nonpositive if abc is nonpositive; we have (abc) mod 7 = 9*a + 3*b + c. Repeat the formula down to a single digit. If the result is 7, 8, or 9, then subtract 7. If, instead, the result is negative, then add 7.

  7. Conversion between Julian and Gregorian calendars - Wikipedia

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

    Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon backward from October 15, 1582. Years are given in astronomical year numbering . Augustus corrected errors in the observance of leap years by omitting leap days until AD 8.

  8. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    For Gregorian dates after 2299, the year in the table which differs by an exact multiple of 400 years should be used. The values "r0" through "r6" indicate the remainder when the Hundreds value is divided by 7 (Julian) or 4 (Gregorian), indicating how the series extend in either direction. Both Julian and Gregorian values are shown for years ...

  9. Calendar era - Wikipedia

    en.wikipedia.org/wiki/Calendar_era

    A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. [1] For example, the current year is numbered 2025 in the Gregorian calendar, which numbers its years in the Western Christian era (the Coptic Orthodox and Ethiopian Orthodox churches have their own Christian eras).