On Nov 12, 10:31 am, Mike Rechtman <m... at rechtman.com> wrote: > $ start = "28-Feb-2008 0:0:0" > $ end = "1-mar-2008 0:0:0" > $ dif = f$delta_time( start,end ) Try it with dates that are more than about 27 years (or 9999 days) apart.