Inverse JD (Julian Date) Calculator For the Julian and Gregorian Calendars

Enter any positive JD number or Julian Date in the range from
JD = `0.00000000`  to  JD = `5373484.00000000`    to compute
the corresponding dates and times on the Julian and Gregorian calendars

Calendar Input Mode:    Julian              Gregorian
 J   2017     June Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

 G   2017     June Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
```
For JD (Julian Date) = 2457928 on the Gregorian Calendar, the
corresponding date and time is: 2017 Jun 23  at 12:00:00.000 - Fri

JD (Julian Day) Number For Gregorian Calendar Date = 2457928
```
NOTE:
There is a distinction to be made between the JD (Julian Date) and the JD (Julian Day) Number. They are not exactly numerically equivalent but can sometimes be confused as such.

The JD (Julian Date) corresponds to a specific date and time of day. It is usually a fractional value and only equates to an integer value at noon on the corresponding date, at which point it also equates to the standard JD Number for that calendar date.

The JD (Julian Day) Number is ALWAYS an integer value. It is simply the sequential serial count of the number of calendar days since the mathema- tical origin of the respective calendar system to which it applies.

Every date on either the Julian or Gregorian calendar system has a unique sequential Julian Day (JD) Number to distinguish it from every other date on the calendar.
Jay Tanner - 2017