[your code here]

[Jonathan M Davis]

On Saturday, May 4, 2019 2:06:59 AM MDT Bastiaan Veelo via Digitalmars-d 
wrote:
> On Saturday, 4 May 2019 at 03:15:59 UTC, Hello wrote:
> > auto today()
> > {
> >
> >     import std.datetime;
> >     auto d = cast(DateTime) Clock.currTime();
> >     import std.format: format;
> >     return format("%04d/%02d/%02d", d.year, d.month, d.day);
> >
> > }
> >
> > void main()
> > {
> >
> >     import std.stdio;
> >     today.writeln;
> >
> > }
>
> The cast is unnecessary, and there is writefln:
>
> void main()
> {
>      import std.datetime, std.stdio;
>      auto d = Clock.currTime();
>      writefln("%04d/%02d/%02d", d.year, d.month, d.day);
> }
>
> https://run.dlang.io/is/wT6Cn7

The cast isn't necessary, but it's more efficient. Internally, it basically
doing the equivalent of casting to DateTime every time you ask for the
pieces of the date/time such as the year or hour. So, whether is casting is
better or not depends on whether you want shorter code or faster code.

- Jonathan M Davis