import std.stdio;
import std.datetime;
import core.time;

void main()
{
    auto p = &writeln;

    // We'll start by getting the current time.
    auto now = Clock.currTime();
    p(now);

    // You can build a SysTime struct by providing the
    // year, month, day, etc. Times are always associated
    // with a TimeZone.
    auto then = SysTime(DateTime(2009, 11, 17, 20, 34, 58), 651387237.hnsecs, UTC());
    p(then);

    // You can extract the various components of the time
    // value as expected.
    p(then.year);
    p(then.month);
    p(then.day);
    p(then.hour);
    p(then.minute);
    p(then.second);
    p(then.fracSecs.total!"nsecs");
    p(then.timezone);

    // The Monday-Sunday DayOfWeek is also available.
    p(then.dayOfWeek);

    // These methods compare two times, testing if the
    // first occurs before, after, or at the same time
    // as the second, respectively.
    p(then < now);
    p(then > now);
    p(then == now);

    // The subtract operator returns a Duration representing
    // the interval between two times.
    auto diff = now - then;
    p(diff);

    // We can compute the length of the duration in
    // various units.
    p(diff.total!"hours");
    p(diff.total!"minutes");
    p(diff.total!"seconds");
    p(diff.total!"nsecs");

    // You can use the addition operator to advance a time by a given
    // duration, or with a - to move backwards by a duration.
    p(then + diff);
    p(then - diff);
}