<td:y> Inserts date's year (e.g., 2000) into the currently active window.

Command Tree:   Text, Date & Time, Keys  \  More Date & Time  \  Today: Year
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Syntax:   <td:y>(Shift)
Shift
The date shift in days relative to the current date.  0 for no shift (today's date), -1 for date one day back (yesterday), +1 for date one day later (tomorrow), etc. 
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Example:   Today it is year: <td:y>(0)<enter>Tomorrow it will be year: <td:y>(1)