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The tables below list equivalent dates in the Julian and Gregorian calendars. Years are given in astronomical year numbering . This is a visual example of the official date change from the Julian calendar to the Gregorian
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]
The Gregorian calendar is the calendar used in most parts of the world. [1] [a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.
This template gives the difference between the Julian and Gregorian calendars in days. The first parameter, the year, is mandatory. Second parameter corresponds to the month.
{{JULIANDAY.JULIAN|300|2|29}} returns 1830692 (first day of difference between the Julian and proleptic Gregorian calendars, in leap Julian year 300 AD, not leap in the proleptic Gregorian calendar) {{JULIANDAY.JULIAN|325|3|21}} returns 1839844 (spring equinox observed at the Christian First Council of Nicaea, taken as a reference for aligning ...
This template computes the number of the Julian day starting at noon on the date given in parameter (in the Gregorian calendar, without any Julian correction for proleptic Gregorian dates where the calendar was not effectively applied). The result is valid for all proleptic Gregorian calendar dates starting on March 1, 4800 BC (−4799) at ...
Before the official and first introduction of the Gregorian calendar, the differences between Julian and proleptic Gregorian calendar dates are as follows: The table below assumes a Julian leap day of 29 February, but the Julian leap day, that is, the bissextile day ( ante diem bis sextum Kalendas Martias in Latin ) was accomplished by ...
I have just written in the Talk pages of Julian Calendar and of Gregorian Calendar. The current discrepancy between Gregorian and Julian calendar is 13 days, and will grow to 14 days in 2100. Notice that in 2100: Feb. 15 (Julian) is Feb. 28 (Gregorian), the 13 day difference I just wrote about. The next day: Feb. 16 (Julian) is March 1 (Gregorian).