On Tuesday, December 02, 2014 14:14:58 Steven Schveighoffer via Digitalmars-d-learn wrote: > On 12/2/14 2:00 PM, H. S. Teoh via Digitalmars-d-learn wrote: > > On Tue, Dec 02, 2014 at 06:49:54PM +0000, via Digitalmars-d-learn wrote: > >>> But still, why this method > >>> http://dlang.org/phobos/std_datetime.html#.Date.add only supports "month" > >>> or "years" while this one > >>> http://dlang.org/phobos/std_datetime.html#.Date.roll does ? > >> > >> But still, why this method > >> http://dlang.org/phobos/std_datetime.html#.Date.add only supports > >> "month" or "years" while this one > >> http://dlang.org/phobos/std_datetime.html#.Date.roll does support days > >> ?* > > > > Hmm. Looks like an oversight. File a bug? > > Not an oversight. > > Date.add and Date.roll are for adding units that are variable. > > For example, how many days are in a month? Answer: depends on the month. > How many days in a year? Answer: depends on the year. > > But days are NOT variable, there are exactly 24 hours in a day. So to > add a day, you just add a day with +=.
Exactly. add wouldn't even exist if it weren't for the fact that Duration doesn't work with units greater than weeks because of they depend on what date you're talking about. - Jonathan M Davis
