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  2. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar is proleptic before 1582 (calculated backwards on the same basis, for years before 1582), and the difference between Gregorian and Julian calendar dates increases by three days every four centuries (all date ranges are inclusive).

  3. Conversion between Julian and Gregorian calendars - Wikipedia

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

    Within these tables, January 1 is always the first day of the year. The Gregorian calendar did not exist before October 15, 1582. 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.

  4. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    At Jefferson's birth, the difference was eleven days between the Julian and Gregorian calendars and so his birthday of 2 April in the Julian calendar is 13 April in the Gregorian calendar. Similarly, George Washington is now officially reported as having been born on 22 February 1732, rather than on 11 February 1731/32 (Julian calendar). [26]

  5. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    Gregorian: 1900 — Gregorian calendar with four 91-day quarters of 13 weeks International Fixed Calendar: solar: Gregorian: 1902 — A "perpetual calendar" with a year of 13 months of 28 days each. Minguo calendar: solar: Gregorian: 1912: Republic of China: Months and days use the Gregorian calendar, introduced in China in 1912. Revised Julian ...

  6. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    A calendar year begins on the New Year's Day of the given calendar system and ends on the day before the following New Year's Day, and thus consists of a whole number of days. The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31. [1]

  7. List of days of the year - Wikipedia

    en.wikipedia.org/wiki/List_of_days_of_the_year

    The following pages, corresponding to the Gregorian calendar, list the historical events, births, deaths, and holidays and observances of the specified day of the year: Jan 1

  8. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly, the number of days between two dates may be calculated, e.g., "25 February 2025" is ten days after "15 February 2025".

  9. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    The Lilian day number is a count of days of the Gregorian calendar and not defined relative to the Julian Date. It is an integer applied to a whole day; day 1 was October 15, 1582, which was the day the Gregorian calendar went into effect. The original paper defining it makes no mention of the time zone, and no mention of time-of-day. [26]