Supports calls to Excel worksheet functions.
The CXlDate class contains only static methods. Each of these methods calls one or more built-in Excel date functions.
Any of these functions may normally be called from worksheet functions.
Many methods throw an exception of type CXlApiException if the call to the Excel API fails. Since this exception is derived from CXlRuntimeException, it will be caught by the add-in wrapper function when these methods are called from within an add-in function.