How far forward and back can the IPhone calendar go?

I was looking through my calendar at old dates and I wanted to see how far back it could go. I got to 1895 and then I got tired.
(1) how far back can it go?
(2) how far forward can it go?

And please no estimations or guessing.

I remember i tried to see how far forward it could go and got to 2500s. It took about 15 minuites

Got to 10000 got bored

Currently at 20014, getting bored already.

22015 and got bored but ironically the days and dates matches of 2015

Yes, I'm just short of crazy. I scrolled to the year 50000…& it was still going. I felt like there are rolls & rolls of adding machine tape all scrunched up inside my phone. Sure isn't the Mayan calendar.