Gaping plot hole

I can't get past the plot hole of the MC not realizing he's been asleep for 10 years even though he seems to be integrating in society full time. Does his workplace not use dates?? Let's say they messed with his memory so he doesn't remember the year he was born... 10 years is a freaking long time. A LOT of things change in 10 years. He should be more confused about the differences in the world. Since the plot relies so heavily on this parameter, I just can't take it serously.