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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]
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
Note that Julian days begin at noon (hour = 12) and thus hours 0–11 of a solar day are one Julian day earlier than hours 12–23. The value may extend outside of the normal range and is considered as additional number of julian days (a Julian day is 24 hours or 86400 seconds exactly, ignoring any adjustment of leap seconds within the UTC ...
Note that Julian days begin at noon (hour = 12) and thus hours 0-11 of a solar day are one Julian day earlier than hours 12-23. The value may extend outside of the normal range and is considered as additional number of julian days (a Julian day is 24 hours or 86400 seconds exactly, ignoring any adjustment of leap seconds within the UTC calendar).
Such ordinal date formats are also used by many computer programs (especially those for mainframe systems). Using a three-digit Julian day number saves one byte of computer storage over a two-digit month plus two-digit day, for example, "January 17" is 017 in Julian versus 0117 in month-day format.
The Revised Julian calendar date of Easter is JD + S − 1. Example. What is the date of Easter in 2017? 2017 + 1 = 2018. 2018 ÷ 19 = 106 remainder 4. Golden number is 4. Date of paschal full moon is April 2 (Julian). From "week table" April 2, 2017 (Julian) is Saturday. JD = April 3. 2017 − 100 = 1917. 1917 ÷ 100 = 19 remainder 17. N = 19 ...
2 Examples with a non-leap secular year ... This template takes a julian day number and returns the associated month number within the Gregorian calendar.
Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details). The number of days between two dates, which is simply the difference in their Julian day numbers.