January 1, 2018. Difficulty rose by +3.10% to 1.93T from 1.87T.
Change
+3.10%
New difficulty
1.93T
Period length
13.6 days
Network hashrate then (7-day)
14.1 EH/s
Bitcoin price then
$13,219
Hashprice then
$1,791/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 3.10%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.