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  2. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Lunar Hijri calendar ("Islamic calendar") is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. [ a ] The astronomer's mean tropical year , which is averaged over equinoxes and solstices, is currently 365.24219 days, slightly shorter than the average length of the calendar year in most calendars.

  3. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The first adjusted the start of a new year from Lady Day (25 March) to 1 January (which Scotland had done from 1600), while the second discarded the Julian calendar in favour of the Gregorian calendar, removing 11 days from the September 1752 calendar to do so.

  4. Quarter days - Wikipedia

    en.wikipedia.org/wiki/Quarter_days

    The British (personal) tax year still ends on "Old" Lady Day (5 April under the 'new style' calendar, which in the 18th century corresponded to 25 March under the 'old style' Julian calendar: the Calendar (New Style) Act 1750 advanced the calendar by eleven days. 5 April is still the end of the British tax year for personal taxation.

  5. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    The Gregorian calendar but using the Buddhist Era (543 BC) Invariable Calendar: solar: 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

  6. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    Year Date of the last day before the change Date of the first day after the change Days omitted Particulars Source Albania: Albania 1912 14 Nov 28 Nov 13 Albanian Catholics have used the Gregorian calendar since 5 Oct 1583. [3] [4] Armenia: Transcaucasian Democratic Federative Republic: 1918 17 Apr 1 May 13 [5] Austria Carinthia: 1583 14 Dec 25 ...

  7. 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]

  8. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.

  9. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    This was previously known as "Industrial date coding". The system specifies a week year atop the Gregorian calendar by defining a notation for ordinal weeks of the year. The Gregorian leap cycle, which has 97 leap days spread across 400 years, contains a whole number of weeks (20 871). In every cycle there are 71 years with an additional 53rd ...