Add features like ThreeTen-Extra #19
Description
What is ThreeTen-Extra
ThreeTen-Extra provides additional date-time classes that complement those in Java SE 8.
Features:
- DayOfMonth
- DayOfYear
- AmPm
- Quarter
- YearQuarter
- YearWeek
- Days, Weeks, Months and Years
- Interval
- PeriodDuration
- Weekend adjusters
- Coptic calendar system
- Ethiopic calendar system
- Julian calendar system
- Support for the TAI and UTC time-scales
I know that few of these features already implemented in AnyDate, and yet other features seems be quite useful in Swift Application Programming.