Date Picker extends the capability of a normal text field with a date picker library.
Figure 1: Date Picker
Figure 2: Date Picker Properties
ID: Element ID
Label: Element Label
Value: Default Value
Format: Please refer to http://docs.jquery.com/UI/Datepicker/formatDate
Date Picker Year Range: Range of years to be shown
Read Only: Determines if this element is editable
Display Field as Label when Read Only: Display the value of the element as plain text when element is set to be as read only.
One may extend the capabilities of this element by adding in Validator as well as mapping the value to a Workflow Variable.
Read more about Validators and Workflow Variables.