Cross out the date you don't like and write your own in Sharpie.
(it's an estimate based on testing & experience..probably related to chemistry, so generaly, cool temp, low light and modest humidity are all good. Rapid changes are bad, evenness in storage conditions are good.)
2013 Starcraft 266RKS
1999 Ford E350 V10 Chateau (6.8L, 4.11 LS)
2005 Cedar Creek 31LBHS
2001 Sprinter 303BHS
1997 Mallard 33Z
1990 Starcraft Starmaster