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.


The following features are included:


Various documentation is available:


Release 1.0 is the current release. This release is considered stable and worthy of the 1.x tag.

ThreeTen-Extra requires Java SE 8 or later and has no dependencies.

Available in Maven Central.


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Version: 1.0. Last Published: 2016-06-13.

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