This option, when turned on, tells nxqddb to automatically format the entries when you tab out of an entry. For example, date fields can accept certain keywords(e.g. today, yesterday, etc.). If you have Force Field Formatting turned on, nxqddb will automatically convert ``today'' to the current day's date (e.g. 12/25/96 if it was Christmas, 1996) when you tab out of the field.
Many users choose Force Field Formatting turned on as their default setting because nxqddb immediately displays the date before saving your entry.