June 4, 2017. Difficulty rose by +13.90% to 678.76B from 595.92B.
Change
+13.90%
New difficulty
678.76B
Period length
12.3 days
Network hashrate then (7-day)
4.9 EH/s
Bitcoin price then
$2,555
Hashprice then
$989/PH/day
The 2,016 blocks before it took 12.3 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 13.90%: 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.