HP Printer Inkjet and Toner cartridges
Which HP Printer type do you have??
HP Ink Cartridges Expiry Dates.

HP has produced an excellent article on ink cartridge expiration, giving their reasons why certain cartridges will not continue to work after this date.
Follow the link below to find out which cartridges will cease to operate on this date, which ones have no expiry date , and which ones can be over ridden.

http://www.hp.com/pageyield/articles/uk/en/InkExpiration.html