The following field will spell out the year a document is created.
{ CREATEDATE \@ "YYYY" \* cardtext \* caps }

The following field will spell out the current year.
{ DATE \@ "YYYY" \* cardtext \* caps }

Two Thousand Fifteen

Note the braces are inserted using Ctrl+F9 (Command+F9), not typed.

Using Date Fields in Microsoft Word

Using date fields in your template means you don't type the date. Word calculates it when you open or create the document based on the template.