Inserts date's day into the currently active window.

Syntax:

<td:d>(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.

Example:

Today's day: <td:d>(0)
Tomorrow's day: <td:d>(1)