Difference Between Dates and Optional Times
Start Date:   ±Y  M  D Start Time:   H M S
Calendar Mode:   Julian            Gregorian
End Date:   ±Y  M  D End Time:   H M S 
Calendar Mode = Gregorian


Start Date/Time   = 2021 September 26 Sun 12:00:00.000
Julian Date       = 2459484
Julian Day Number = 2459484

————————————————————
2021       September

Su Mo Tu We Th Fr Sa
          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
————————————————————


*******************************************************


End Date/Time     = 2021 September 26 Sun 12:00:00.000
Julian Date       = 2459484
Julian Day Number = 2459484

————————————————————
2021       September

Su Mo Tu We Th Fr Sa
          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
————————————————————

DIFFERENCE BETWEEN DATES AND TIMES
= (JD2 − JD1) = 0 d
= 0 Gregorian yr
=  0d  00h 00m 00s