In the EU pre amble to 1178/2011, 8th April 2012 is the Part FCL date, and other dates and derogations flow from this date. However to quote CAP 804,
Forward
1.2 Status
1.2.1 Cap 804 applies with effect from July 1st 2012.....
PS For the diehards, 1178/2011 is entitled "Official Journal of the European Union" and signed on behalf of the (non elected) european commission by Mr Barroso!