I have a field (Status Update Date) that should be updated with the current date/time when another field (Status) is changed.  However, whenever ANY field in the row (datasheet view) is updated the Status Update Date us updating to the current date/time.  Any ideas on how to ensure the field is only updated with current date/time when the Status field is updated? 

    =IF(ISBLANK(Status),1/2/1900,TEXT(NOW(),"mm/dd/yyyy hh:mm:ss"))