Thank you Digger450. Would I be correct in my calculation? If I use the DS1307 as my real clock and source for the time stamp, and if the AccessCode+TimeStamp were stored in 8 bytes and the( access codes maximum of 6 characters ) then I'm looking at 8 bytes per entry. I have the atmega328 on the Arduino which has 1K EEPROM. With this calculation I could store more than 120 entries which is good enough between resets every 3-4 weeks. Can I store the AccessCode+TimeStamp in 8 bytes? Thanks for the reply.