April 5, 2013. Difficulty rose by +14.59% to 7.67M from 6.70M.
Change
+14.59%
New difficulty
7.67M
Period length
12.2 days
Network hashrate then (7-day)
0.0 EH/s
Bitcoin price then
$133
Hashprice then
$3,980,594/PH/day
The 2,016 blocks before it took 12.2 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 14.59%: 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.