February 28, 2014. Difficulty rose by +21.92% to 3.82B from 3.13B.
Change
+21.92%
New difficulty
3.82B
Period length
11.5 days
Network hashrate then (7-day)
0.0 EH/s
Bitcoin price then
$583
Hashprice then
$77,413/PH/day
The 2,016 blocks before it took 11.5 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 21.92%: 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.