October 26, 2017. Difficulty rose by +21.39% to 1.45T from 1.20T.
Change
+21.39%
New difficulty
1.45T
Period length
11.5 days
Network hashrate then (7-day)
10.3 EH/s
Bitcoin price then
$5,835
Hashprice then
$1,122/PH/day
The 2,016 blocks before it took 11.5 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 21.39%: 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.