February 20, 2018. Difficulty rose by +4.62% to 3.01T from 2.87T.
Change
+4.62%
New difficulty
3.01T
Period length
13.4 days
Network hashrate then (7-day)
22.5 EH/s
Bitcoin price then
$10,979
Hashprice then
$839/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 4.62%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.