The Easter date

So Christianity is largely based on the fact the son of god sacrificed his life to repent our sins.

I always wondered why Easter always changes date. Why good Friday and lent change date every year.

Now I know

[link to en.m.wikipedia.org (secure)]

The date a certain someone died on a cross or rose from a tomb. It’s a calculation.

So do we actually know when this Jesus died or if he even died. If he existed at all. If he actually rose as I’d have thought that there would be records from Pilot that would pinpoint the date.