Shift Calendar for SWING

I m开发者_如何转开发ay need to implemet a work shift calendar for a java/sql application. Does anyone know of a free API, or do i have to design the thing from scratch?

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there are plenty of JCalendar, JDatePicker with various Licencing, but really free Calendar as I know is very good SwingX Calendar made by kleopatra

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Take a look at this one:

http://www.toedter.com/en/jcalendar/