An expiration management method and system. The method includes transmitting by an RFID tag reader within an enclosure, a plurality of continuous timing signals. The enclosure comprises a container comprising a product and an RFID tag. The RFID tag comprises data indicating a first state for the RFID tag and a first time period. The RFID tag reader receives the data and generates a first time stamp. The RFID tag reader transmits a first message commanding the RFID tag to enter a second state. The RFID tag reader transmits the first time stamp and generates a second time stamp. The RFID tag reader transmits the second time stamp. The RFID tag reader receives results from a comparing process performed by the RFID tag. The RFID tag reader performs a function indicating the results.