Spinner consists of source for a DateSpinner and classes to add hex and formatted dollar input/output for Java JSpinner to your own Java programs. The DateSpinner lets you enter dates by either keying yyyy-mm-dd or using a three separate spinners for year, month and day. It won't let you enter an illegal date or one out of bounds. If you spin a day too high, like an odometer, it kicks over to the next month. There is quite complex internal logic that ensures the three spinners interact in intuitively expected ways. Spinner offers two NumberFormatter classes you can use with a JSpinner. One is HexNumberFormatter which lets your JSpinner range over hex values. The other is DollarNumberFormatter which lets your JSpinner range over dollar values. It works better than JSpinner.NumberEditor with a DecimalFormat String since DollarNumberFormatter displays the $ without requiring it on input. Further, DollarNumberFormatter automatically rounds all values to the nearest penny. The program does nothing on its own other that demonstrate the use of the three classes. The classes are designed to be used in your own programs. You can see DateSpinners in production in the biorhythms calculator at http://mindprod.com/applet/bio.html Why the double arrow icon? That's what the up/down control on a Java JSpinner looks like.