> On Wed, 23 Feb 2005, mohsen ali momeni wrote: > >> Now something else , >> For AddDate and DateDiff functions, I need an algorithm which >> calculates the number of leap years between two given Date. Is there >> any such algorithm or at least a documentation for the above >> algorithms (jalali.c) so that i can find it in the code myself? (Or >> AddDate, DateDiff functions ready in ideal case) >> >> Regards, >> Mohsen A. Momeni > > Well, that's why I'm saying your implementation is not what MySQL > people expect. The date data type is representation-agnostic > itself, and AddDate, DateDiff, etc work with the date data type > (at least in MySQL). What you need is functions to covert from > internal date representation to Iranian calendar string, and vice > versa. You don't need (and should not) implement all date > functions again. > > > --behdad > http://behdad.org/
I'm not sure how the date data type can be representation agnostic. What ever the OS provides (via a system call) is in reference to a starting point in some calendar. On UNIX systems, this is traditionally the number of seconds since January 1, 1970, i.e. Gregorian. GetSystemTime on Win32 returns a structure, which represents the Gregorian date. _______________________________________________ PersianComputing mailing list PersianComputing@lists.sharif.edu http://lists.sharif.edu/mailman/listinfo/persiancomputing
