not like the year you play in matters that much for your own RP.
just agree with those you role play with on years and events and on how long ago they happened or when they will happen.
i am going my 820 myself, since i am too lazy to downgrade old dates or make up random non-existing months.
if you really dunno what to do just say. "a year ago.", "one year from now", "currently.", "some days ago" or simply don't mention the year at all and just use days and months.