April 30, 2013. Difficulty rose by +12.28% to 10.08M from 8.97M.
Change
+12.28%
New difficulty
10.08M
Period length
12.5 days
Network hashrate then (7-day)
0.0 EH/s
Bitcoin price then
$145
Hashprice then
$5,127,036/PH/day
The 2,016 blocks before it took 12.5 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 12.28%: 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.