Adding days to std.datetime.Date

[via Digitalmars-d-learn]

On Thursday, 7 April 2011 at 19:10:40 UTC, Piotr Szturmaj wrote:
> Is it possible to add a particular number of days to a Date?
>
> I have number of days since 1 Jan 2000 and I want to convert it 
> to Date:
>
> int days = read!int; // number of days since 1 Jan 2000
> Date x = Date(2000, 1, 1);
> x.add!"days"(days);
>
> Unfortunately add() does not support adding days. Will it be 
> possible in the future or is there another approach?
>
> Thanks

Is there any particular reason why std.datetime's "add" does not 
support days ?