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  2. Conversion between Julian and Gregorian calendars - Wikipedia

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

    If conversion takes you past a February 29 that exists only in the Julian calendar, then February 29 is counted in the difference. Years affected are those which divide by 100 without remainder but do not divide by 400 without remainder (e.g., 1900 and 2100 but not 2000).

  3. Generation time - Wikipedia

    en.wikipedia.org/wiki/Generation_time

    In human populations, generation time typically has ranged from 20 to 30 years, with wide variation based on gender and society. [1] [2] Historians sometimes use this to date events, by converting generations into years to obtain rough estimates of time.

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

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

    Previously used the Thai lunar calendar. The year numbering followed the Rattanakosin Era until 1912, when it was replaced by the Buddhist era; see Thai solar calendar. Turkey: Ottoman Empire: 1917 15 Feb 1 Mar 13 The year numbering followed the Rumi calendar until 1 Jan 1926, when the Anno Domini era was adopted. Uganda: British Empire: 1893 ...

  5. Before Present - Wikipedia

    en.wikipedia.org/wiki/Before_Present

    Conversion from Gregorian calendar years to Before Present years is by starting with the 1950-01-01 epoch of the Gregorian calendar and increasing the BP year count with each year into the past from that Gregorian date. For example, 1000 BP corresponds to 950 AD, 1949 BP corresponds to 1 AD, 1950 BP corresponds to 1 BC, 2000 BP corresponds to ...

  6. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The corresponding date in the Gregorian calendar is 9 February 1649, the date by which his contemporaries in some parts of continental Europe would have recorded his execution. The O.S./N.S. designation is particularly relevant for dates which fall between the start of the "historical year" (1 January) and the legal start date, where different.

  7. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    A calendar date is fully specified by the year (numbered according to a calendar era, in this case Anno Domini or Common Era), the month (identified by name or number), and the day of the month (numbered sequentially starting from 1). Although the calendar year currently runs from 1 January to 31 December, at previous times year numbers were ...

  8. Spanish era - Wikipedia

    en.wikipedia.org/wiki/Spanish_era

    The Spanish era (Latin: Æra Hispanica), sometimes called the era of Caesar, was a calendar era (year numbering system) commonly used in the states of the Iberian Peninsula from the 5th century until the 15th, when it was phased out in favour of the Anno Domini (AD) system. [1] The epoch (start date) of the Spanish era was 1 January 38 BC.

  9. Wikipedia:Age calculation templates - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Age_calculation...

    Wikipedia uses several templates that self-update every day to keep date and age information current. These are very useful for a dynamic online encyclopedia and save users from having to regularly update that kind of information.