January 22, 2017. Difficulty rose by +16.64% to 392.96B from 336.90B.
Change
+16.64%
New difficulty
392.96B
Period length
12.0 days
Network hashrate then (7-day)
2.8 EH/s
Bitcoin price then
$893
Hashprice then
$570/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 16.64%: 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.