The Antarctic Sea Ice Extent on Sept 13 2014 may have set a new all time record (at least for the satellite era, we don’t have data prior to that).
Southern Hemisphere Sea Ice Extent With Anomaly
Sunshine hours writes: Antarctic Sea Ice Extent Sept 13 2014 – 1,121,000 sq km above the 1981-2010 mean. Data for Day 255. Data here.
Breaking the record set in 2013 by 48,000 sq km.