WP34S - 3.3/3384 IR/Crystal Issue

[rprosperi]

I believe the SETDAT command wants the input to be in the same format as the current display format. Possibly you have dd.mmyyyy set for display, but you're entering the new date in mm.ddyyyy format (or vice-versa) and a month of 22 or 23 won't work, although the manual indicates this error message should be "bad time or date".