If you look at the VHSL site, it clearly states the semi's are to be played on Dec 5th for the 2015 season and Dec 3rd for the 2016 season.
Not sure why the confusion for a Friday date but I think someone got their info mixed up.
http://www.vhsl.org/athletics.football
Football
Contest Limits - 10 games
Minimum Practice Requirements
Season Information 2015 2016
First Practice July 30, 2015
July 28, 2016
First Contest Aug. 24-29, 2015 Aug. 22-27, 2016
District Deadline
Nov. 7, 2015 Nov. 5, 2016
Playoff Deadline - 1st round
Nov. 14, 2015 Nov. 12, 2016
Playoff Deadline - 2nd round
Nov. 21, 2015 Nov. 19, 2016
Playoff Deadline - 3rd round Nov. 28, 2015 Nov. 26, 2016
VHSL Semifinals Dec. 5, 2015 Dec. 3, 2016
VHSL Championships Dec. 12, 2015 Dec. 10, 2016