2+0+2+1 = 5

2+0 = 2*1... it's a symmetrical year!

2*0*... OK, I don't need to go further than that.

2/0/... : it's an infinite year!

[[2^0]^2]^1] = 1

Two thousand and twenty one years since... wait: Two thousand?

What, only two thousand? And twenty one, don't forget.

Exciting.

Happy New Year! Wishing you diversions manifold!