DateTime(int year, [ int month = 1, int day = 1, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microsecond = 0 ])

Constructs a DateTime instance specified in the local time zone.

For example, to create a new DateTime object representing April 29, 2014, 6:04am:

DateTime annularEclipse = new DateTime(2014, DateTime.APRIL, 29, 6, 4);

Source 

DateTime(int year,
    [int month = 1,
    int day = 1,
    int hour = 0,
    int minute = 0,
    int second = 0,
    int millisecond = 0,
    int microsecond = 0])
    : this._internal(year, month, day, hour, minute, second, millisecond,
          microsecond, false);