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  2. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 September 2024" is ten days after "15 September 2024". The date of a particular event depends on the observed time zone.

  3. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The year used in dates during the Roman Republic and the Roman Empire was the consular year, which began on the day when consuls first entered office—probably 1 May before 222 BC, 15 March from 222 BC and 1 January from 153 BC. [44] The Julian calendar, which began in 45 BC, continued to use 1 January as the first day of the new year. Even ...

  4. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752". [1] Old Style (O.S.) and New Style (N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in ...

  5. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. [1][2][3] A date is the designation of a single and specific day within such a system. A calendar is also a physical record (often paper) of such a system.

  6. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

  7. World Calendar - Wikipedia

    en.wikipedia.org/wiki/World_Calendar

    The World Calendar is a 12-month, perennial calendar with equal quarters. [1] Each quarter begins on a Sunday and ends on a Saturday. The quarters are equal: each has exactly 91 days, 13 weeks, or 3 months. The three months in each quarter have 31, 30, and 30 days respectively. Each quarter begins with the 31-day months of January, April, July ...

  8. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    No date is offered for the Regifugium in 378-day years. [84] Macrobius describes a further refinement whereby, in one 8-year period within a 24-year cycle, there were only three intercalary years, each of 377 days. This refinement brings the calendar back in line with the seasons and averages the length of the year to 365.25 days over 24 years.

  9. Calendar era - Wikipedia

    en.wikipedia.org/wiki/Calendar_era

    The Japanese calendar dates from the accession of the current Emperor of Japan. The current emperor took the throne in May 2019, which became Reiwa 1, and which was until then Heisei 31. The United States government sometimes uses a calendar of the era of its Independence, fixed on 4 July 1776, together with the Anno Domini civil calendar