April 17, 2013. Difficulty rose by +16.96% to 8.97M from 7.67M.
Change
+16.96%
New difficulty
8.97M
Period length
12.0 days
Network hashrate then (7-day)
0.0 EH/s
Bitcoin price then
$68
Hashprice then
$3,886,418/PH/day
The 2,016 blocks before it took 12.0 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 16.96%: 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.