Services to manipulate Date, Time and DateTime

The services are split in 2 classes:

• Date handles the year, month and day parts of the date.
• Time handles the time in hours, minutes and seconds.

These are united in DateTime for a precise time in a precise day.

var now = new Time.now
var midnight = new Time(0, 0, 0)
assert now > midnight

var nine_thirty = new Time(9, 30, 0)
var eleven_twenty = new Time(11, 20, 0)
assert eleven_twenty > nine_thirty

var pi_day = new Date(2015, 03, 14)
var may_the_fourth = new Date(2015, 5, 4)
assert pi_day < may_the_fourth

var now_t = new DateTime.now
var epoch = new DateTime(1970, 1, 1, 0, 0, 0)
assert now_t > epoch