R. Matthew,

As in

REPLACE dateupdate WITH DATE() IIF(TABLEUPDATE(.T.),TABLEREVERT(.T.))

???

No, you are trying to do too much in one line of code. In your save code you can;

REPLACE dateupdate with Date()
IF NOT TableUpdate()
  TableRevert()
ENDIF

Of course you should be using all of the arguments for TableUpdate and TableRevert to prevent unexpected results (see the help file on those functions)