Number of days between two dates

Add (or subtract) days to a certain date

NOTE: You can also write dates before Christ, by using negative numbers, as the following examples:
1 b.C. = 0; 2 b.C. = -1; 44 b.C. = -43; etc. The result could be not exact for periods before 15 A.D., and surely not exact for periods before the Julian reform of 46 b.C.

I got the algorithm from the function to calculate the Julian number offered by Claus Tondering in his web site.

The calendar

Versione italiana

First date: (previous)	day	month	year
Last date: (following)	day	month	year

Initial date:	day	month	year
Number of days to add (or subtract) to the initial date:
(put - before if you want to subtract)

Final date:	day	month	year