In some cases, Tableau Desktop renames fields after they've been dragged to a shelf.
For example the Date field might be renamed to YEAR(Date) after being dragged to the rows shelf.
Below is a quick guide to deciphering date code meanings.
Locale IDs identify a set of regional conventions and are used in APIs—such as the classes—where region information is needed to format data.
OS X and i OS use standard language ID and locale ID formats that consist of language and region designators.
To specify a script, combine a language designator with a script designator.
Apply filters to display a subset of the data available for a view.
In this case, you should use YEAR(Date) as the parameter.