The dialog is displayed when you click the button 
in the Expression dialog. It provides some built-in functions of the Date/Time type for you to edit a template expression to create your own expression. See the dialog.
The current expression is displayed at the top of the dialog. Edit it directly in the text field. If required, you can insert a function into the expression by double-clicking it from the built-in function list below. For details about the functions, see Date/Time in the Formula Reference chapter of the JReport Designer User's Guide.
OK
Saves the expression and closes the dialog.
Cancel
Does not retain any changes and closes the dialog.
Help
Displays this help document.
