March 17, 2017. Difficulty rose by +3.24% to 475.71B from 460.77B.
Change
+3.24%
New difficulty
475.71B
Period length
13.6 days
Network hashrate then (7-day)
3.4 EH/s
Bitcoin price then
$1,111
Hashprice then
$620/PH/day
The 2,016 blocks before it took 13.6 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 3.24%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.