December 28, 2016. Difficulty rose by +2.43% to 317.69B from 310.15B.
Change
+2.43%
New difficulty
317.69B
Period length
13.7 days
Network hashrate then (7-day)
2.4 EH/s
Bitcoin price then
$930
Hashprice then
$716/PH/day
The 2,016 blocks before it took 13.7 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 2.43%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.