The easiest way is to convert your dates into a serial day number(i.e. the number of days that have elapsed between your date, and some arbitrary date in the dim and distant past - I think PHP uses 25th November, -4714). There are some calendar functions in php that will do this for you. Once you have your dates as a numeric offset, you can subtract them to get a the number of days between the dates, or you can add or subtract a number of days to get a new offset. Once you have the new offset, there are reverse calendar functions in php, to convert your new offset back to a calendar date.
Check out the functions GregorianToJD(), and JDToGregorian(), in the Calendar functions of the PHP manual. If you do not have access to the calendar functions in your version of php, there are also a couple of examples how to do one of the conversions written in PHP, in the user contributed notes of the manual. There are also many published articles describing algorithms on how to do this. I can remember implementing these functions in 1977(Not in PHP of course), from an article published in the journal of the ACM, in 1963.
Hope this helps. . . Fred
Qt wrote:
Dear Sirs, How can I add or subtract two date easily. Is therea any lib or function about this. I can not find any easy way in the manualBest Regards
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