April 27, 2018. Difficulty rose by +4.76% to 4.02T from 3.84T.
Change
+4.76%
New difficulty
4.02T
Period length
13.4 days
Network hashrate then (7-day)
28.2 EH/s
Bitcoin price then
$9,002
Hashprice then
$577/PH/day
The 2,016 blocks before it took 13.4 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 4.76%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.