DateTime.opBinary

[anonymous via Digitalmars-d-learn]

On 30.11.2015 00:25, bachmeier wrote:
> I was just reading through the documentation for std.datetime.
> DateTime.opBinary looks pretty interesting:
>
> http://dlang.org/phobos/std_datetime.html#.DateTime.opBinary
>
> Does anyone know how to use it? You certainly can't learn anything from
> the documentation, because duration is a mystery. If someone knows, I
> can submit a PR with that information added.

You can add a Duration to a DateTime, giving you a new DateTime. And you 
can subtract a DateTime from another, giving you the Duration between them.

Example:
----
import std.datetime, std.stdio;
void main()
{
     DateTime oldYear = DateTime(2015, 12, 31, 23, 59, 59);
     writeln(oldYear); /* 2015-Dec-31 23:59:59 */
     DateTime newYear = oldYear + 1.seconds; /* adding Duration to 
DateTime */
     writeln(newYear); /* 2016-Jan-01 00:00:00 */
     Duration diff = newYear - oldYear; /* subtracting DateTime from 
DateTime */
     writeln(diff); /* 1 sec */
}
----