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Joda-Time provides a quality replacement for the Java date and time classes. The design allows for multiple calendar systems, while still providing a simple API. The 'default' calendar is the ISO8601 standard which is used by XML. The Gregorian, Julian, Buddhist, Coptic, Ethiopic and Islamic systems are also included, and we welcome further additions. Supporting classes include time zone, duration, format and parsing.
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The base for JSR 310 (http://jcp.org/en/jsr/detail?id=310). A sane date/time API that's so much better than the crappy Date and Calendar that's in the JDK today.
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A great library for all date and time operations. A must-have for each project when any date operations are needed. Great intuitive, fluid API. Some libs supports Joda DateTime objects instead java.util.Date (e.g. mappers for JPA).