October 15, 2017. Difficulty rose by +6.49% to 1.20T from 1.12T.
Change
+6.49%
New difficulty
1.20T
Period length
13.2 days
Network hashrate then (7-day)
8.6 EH/s
Bitcoin price then
$5,474
Hashprice then
$994/PH/day
The 2,016 blocks before it took 13.2 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 6.49%: a large adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.