June 16, 2013. Difficulty rose by +23.92% to 19.34M from 15.61M.
Change
+23.92%
New difficulty
19.34M
Period length
11.3 days
Network hashrate then (7-day)
0.0 EH/s
Bitcoin price then
$100
Hashprice then
$3,497,236/PH/day
The 2,016 blocks before it took 11.3 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 23.92%: 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.