His mouth kind of fell open, and he kind of blinked a few times as he tried to figure out how best to reply to that.
"It's... 2518..." he managed finally. That was all he could really bring himself to say on the subject. 1970s? What... was she talking about?
He couldn't think of anything else to say, he was utterly bewildered, and - ironically enough - he almost wished that River was around. To explain it to him. Oh lord, he must be bad off if he needed her here for an explanation.