About

ThreeTen-Extra provides additional date-time classes that complement those in Java SE 8.

Not every piece of date/time logic is destined for the JDK. Some concepts are too specialized or too bulky to make it in. This project provides some of those additional classes as a well-tested and reliable jar. It is curated by the primary author of the Java 8 date and time library, Stephen Colebourne.

ThreeTen-Extra is licensed under the business-friendly BSD 3-clause license.

Features

The following features are included:

• DayOfMonth - a day-of-month without month or year
• DayOfYear - a day-of-year without year
• AmPm - before or after midday
• Quarter - the four quarters, Q1, Q2, Q3 and Q4
• YearQuarter - combines a year and quarter, 2014-Q4
• YearWeek - combines a week-based-year and a week, 2014-W06
• Days, Weeks, Months and Years - amounts of time
• Interval - an interval between two instants
• PeriodDuration - combines Period and Duration
• Weekend adjusters
• Coptic calendar system
• Ethiopic calendar system
• Julian calendar system
• Word-based period and duration formatting
• Support for the TAI and UTC time-scales

Documentation

Various documentation is available:

• The helpful user guide
• The Javadoc
• The change notes for each release
• The GitHub source repository