Thank you for removing That Which Was Not. 

 The release dates check out on IMDB. As for the battle dates given, both for the Alderangriff and the bombing of London, they are in almost all sources, notably Shirer's Rise and Fall of the Third Reich, which is from our perspective an almost contemporary source, as well as Charles Messenger's much more recent Chronological Atlas of World War Two.  

 In addition, one will find the date for the beginning of the Alderangriff in Chronik des Zweiten Weltkriegs published by the Chronik Verlag in Wissen Media Verlag, GmbH (Guttersloh/Munchen, 2004), Buch-Nr. 10808; but, perhaps not so surprisingly, not many other details about the bombing of England.  

 Insofar as checked, these dates also agree with the existing Wikipedia articles on the Battle of Britain and the Blitz, so the sources cited in those articles (if any) may be suitable. 

 In fact, the story of the first appreciable bombing of London on August 24th, and its immediate ramifications, was not so long ago an almost universally known and accepted version of how the German strategy to cow England into submission through air superiority failed.  

 One certainly heard about it from one's parants, uncles, etc. whenever a teevee show or movie or anniversary story on the news brought the subject up, back in the days when almost all adults remembered the war; but this is of course anecdotal and unverifiable.