php - How to calculate the number of days between two dates starting from B.C.5000? -

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would have function before christ date , taking account gregorian , julian calendar. have found solutions a.d. dates have not found 1 b.c. , solution requires lot of manual calculation. there elegant way in php have missed? existing built in function mean.

http://www.timeanddate.com/date/duration.html

i rewrote original calendar.php function , add in own solution.

thanks.


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