On Sat, Mar 1, 2008 at 8:42 AM, Brice <brice.favre@xxxxxxxxx> wrote: > I like this way too but it will not work with a date before the first > January 1901. > > Do you have another method? the DateTime class uses an unsigned 64 bit integer to represent the unix timestamp internally. as a result it can handle such dates w/o a problem. php > $dt1 = date_create('1856-02-27'); php > $dt2 = date_create('1855-12-03'); php > echo ($dt1->format('U') - $dt2->format('U')) / 86400; 86 -nathan