What shell are you using? It is possible in the Korn shell.
Impossible in the Bourne shell. I don't know about the C-shell.
My prompt includes a clock that is updated at every keystroke.
--
Larry Cipriani Cornet 353-4999 AT&T (614) 860-4999
{ihnp4|cbosgd}!cbsck!lvc AT&T Network Systems rm 2B-220