POS system including use of expiration dates in commodity codes

摘要

A POS terminal device which performs the function of a cash register upon input of a commodity code, with date and hour data included in the commodity code being checked at the time of data input and a caution indication that the term of validity has expired or the term of validity is approaching. The POS terminal device comprising time measuring device, input device for inputting a commodity code including date and hour data, judgment step for comparing date and hour data indicated by the time measuring device with date and hour data included in a commodity code inputted by the input device, and caution device, whereby in the case where the date and hour data indicated by the time measuring device represents a time not earlier than that represented by the date and hour data included in the commodity code as a result of comparison in the judgment step, and which informs an operator about that fact.