November 5, 2013. Difficulty rose by +30.70% to 510.93M from 390.93M.
Change
+30.70%
New difficulty
510.93M
Period length
10.7 days
Network hashrate then (7-day)
0.0 EH/s
Bitcoin price then
$230
Hashprice then
$204,845/PH/day
The 2,016 blocks before it took 10.7 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 30.70%: 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.