Can't understand how to compare DateTime with opCmp

[Rene Zwanenburg via Digitalmars-d-learn]

On Sunday, 1 February 2015 at 15:04:39 UTC, Suliman wrote:
> I need to compare to DateTime. I looked at docs and found opCmp 
> for DateTime type.
> The problem is that I can't understand how to use it.
>
> http://dlang.org/phobos/std_datetime.html#DateTime
>
> opCmp(in DateTime rhs);
>
> what is rhs?
>
> I am trying to do something like this:
> if( DateTime.opCmp(dtindb, outoftime));
>
> But it's seems that I wrong understand how to use this 
> function...

opCmp is the operator overload for the comparison operators, so 
you can simple write:

if(dtindb < outoftime)

and it should work.