January 13, 2018. Difficulty rose by +15.36% to 2.23T from 1.93T.
Change
+15.36%
New difficulty
2.23T
Period length
12.1 days
Network hashrate then (7-day)
16.4 EH/s
Bitcoin price then
$13,353
Hashprice then
$1,669/PH/day
The 2,016 blocks before it took 12.1 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 15.36%: one of the largest adjustments on record. For every machine on the network that is a pay cut of the same size until the next retarget.