import 'dart:core';

void main() {
  void p(Object obj) => print(obj);

  // We'll start by getting the current time.
  var now = DateTime.now();
  p(now);

  // You can create a DateTime object by providing the year, month, day, etc.
  // Times are always associated with a time zone.
  var then = DateTime.utc(2009, 11, 17, 20, 34, 58, 651387);
  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.millisecond);
  p(then.microsecond);
  p(then.timeZoneName);

  // The weekday is also available.
  p(then.weekday);

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

  // The difference method returns a Duration representing
  // the interval between two times.
  var diff = now.difference(then);
  p(diff);

  // We can compute the length of the duration in various units.
  p(diff.inHours);
  p(diff.inMinutes);
  p(diff.inSeconds);
  p(diff.inMilliseconds);

  // You can use add to advance a time by a given duration,
  // or subtract to move backwards by a duration.
  p(then.add(diff));
  p(then.subtract(diff));
}