How does current target is defined for calculating the difficulty?

How does current target is defined for calculating the difficulty?

I was studying about how does the difficulty define in the block and found the below formula -

   D (difficulty) = T(max) / T
   wehere T (max) is 1d00ffff

After searching more about how to calculate the current target, I got to know about one formula -

T (n+1) = (Tn x (T (last 2016 blocks)))/2016

But still not able to find exactly how the current target hash is calculated? Can you please let me know how to calculate the current target hash? Any example for calculating the current target hash would be very helpful for me.

https://ift.tt/2xhbAAU

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