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  2. Conversion between Julian and Gregorian calendars - Wikipedia

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

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the

  3. Bissextus - Wikipedia

    en.wikipedia.org/wiki/Bissextus

    Bissext, or bissextus (from Latin bis 'twice' and sextus 'sixth') is the leap day which is added to the Julian calendar every fourth year and to the Gregorian calendar almost every fourth year to compensate for the almost six hour difference in length between a common calendar year of 365 days and the average length of the solar year.

  4. 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 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.

  5. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The Gregorian calendar reform also dealt with the accumulated difference between these figures, between the years 325 and 1582, by skipping 10 days to set the ecclesiastical date of the equinox to be 21 March, the median date of its occurrence at the time of the First Council of Nicea in 325.

  6. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    The Julian date (JD) of any instant is the Julian day number plus the fraction of a day since the preceding noon in Universal Time. Julian dates are expressed as a Julian day number with a decimal fraction added. [8] For example, the Julian Date for 00:30:00.0 UT January 1, 2013, is 2 456 293.520 833. [9]

  7. Google Calendar - Wikipedia

    en.wikipedia.org/wiki/Google_Calendar

    Google Calendar is a time-management and scheduling calendar service developed by Google.It was created by Mike Samuel as part of his 20% project at Google. [5] [6] It became available in beta release April 13, 2006, and in general release in July 2009, on the web and as mobile apps for the Android and iOS platforms.

  8. It takes longer than 21 days to form a habit. Here's why ...

    www.aol.com/lifestyle/takes-longer-21-days-form...

    “You would never say, ‘21 days to a great marriage.’” Tips for better habit forming If you want to create a new habit, the No. 1 tip experts have is to be patient and keep trying, even ...

  9. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    The doomsday's anchor day calculation is effectively calculating the number of days between any given date in the base year and the same date in the current year, then taking the remainder modulo 7. When both dates come after the leap day (if any), the difference is just 365y + ⁠ y / 4 ⁠ (rounded down). But 365 equals 52 × 7 + 1, so after ...