September 25, 2013. Difficulty rose by +32.13% to 148.82M from 112.63M.
Change
+32.13%
New difficulty
148.82M
Period length
10.6 days
Network hashrate then (7-day)
0.0 EH/s
Bitcoin price then
$124
Hashprice then
$413,671/PH/day
The 2,016 blocks before it took 10.6 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 32.13%: 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.