Can’t believe the main plot revolves around him never, not once, ever looking at a calen...

Omg never realised that

It says that his memory got edited, he just remember fragments and forgot most of his life. So he knows his parents, some bits of childhood and college, but doesn't know the exact dates, I assume.
They told him that he was on the states when a accident happened, but in truth he was working in korea for several months. They erased that part.

Yeah but like did they change his birthday too and fake his documents?