> > I'd say that the same applies .. add one month: > > 01:00 26 January 2003 + 1 month = 01:00 26 February 2003 > > 01:00 26 February 2003 + 2 months = 01:00 26 April 2003 > > Hmm, I'm sure there are cases where people want the other implementation, > though. >
I think that arises from fuzzy thinking. Lots of people assume that date units are reducable to seconds (I think influenced by years of working with epoch seconds), but reducing discrete units like months, weeks, and days to their time components is always going to produce weird unpredictable results. If they want to add the equivalent of 30 days in seconds vs. 1 month let them do that, we could even provide some constants like SECS_IN_DAY to make it easier. I think like the earlier rule of thumb about dates start at 1, times start at 0, it would be good rule of thumb that when adding date components the time stays the same. kellan
