void main()
{
    import core.time;
    import std.stdio: write, writeln, writef, writefln;
    {
        auto d = dur!"days"(12) + dur!"minutes"(7) + dur!"usecs"(501223);
        long days;
        int seconds;
        short msecs;
        d.split!("days", "seconds", "msecs")(days, seconds, msecs);
        assert(days == 12);
        assert(seconds == 7 * 60);
        assert(msecs == 501);

        auto splitStruct = d.split!("days", "seconds", "msecs")();
        assert(splitStruct.days == 12);
        assert(splitStruct.seconds == 7 * 60);
        assert(splitStruct.msecs == 501);

        auto fullSplitStruct = d.split();
        assert(fullSplitStruct.weeks == 1);
        assert(fullSplitStruct.days == 5);
        assert(fullSplitStruct.hours == 0);
        assert(fullSplitStruct.minutes == 7);
        assert(fullSplitStruct.seconds == 0);
        assert(fullSplitStruct.msecs == 501);
        assert(fullSplitStruct.usecs == 223);
        assert(fullSplitStruct.hnsecs == 0);

        assert(d.split!"minutes"().minutes == d.total!"minutes");
    }

    {
        auto d = dur!"days"(12);
        assert(d.split!"weeks"().weeks == 1);
        assert(d.split!"days"().days == 12);

        assert(d.split().weeks == 1);
        assert(d.split().days == 5);
    }

    {
        auto d = dur!"days"(7) + dur!"hnsecs"(42);
        assert(d.split!("seconds", "nsecs")().nsecs == 4200);
    }

    {
        auto d = dur!"days"(-7) + dur!"hours"(-9);
        auto result = d.split!("days", "hours")();
        assert(result.days == -7);
        assert(result.hours == -9);
    }


}