User blog comment:IMCR8Z/Plants vs. Zombies 2 World Idea: Compost-Apocalypse/@comment-26013832-20150501165617/@comment-4775209-20150501180109

I think either you're confusing that year with the "Zombie Wars of 76" mentioned in PvZ 1 Imitater's almanac entry, or that it's just a coinincidence.