Thread:Tupka217/@comment-24845073-20140726113351/@comment-3419446-20140727124922

DrJohnnyDiablo wrote: Secret Origins #6 gives June 26, 1924 as the date of the Wayne murders on Earth-Two. Bruce's headstone in America vs. the Justice Society #1 says 1915-1979. Helena Wayne was born in 1957, according to her headstone in The Last Days of the Justice Society special.

And in general, Earth-Two stories are assumed to take place several months before their publication dates as stated often by Roy Thomas in the 1980s in All-Star Squadron, Infinity, Inc. and related works.

A good source for Earth-Two Batman dates: The Golden Age Batman Chronology

Agreeing on all points - however, for completeness´ sake and as a maybe self-evident point, only _modern_ Earth-Two stories (i.e. post-Flash 123) adhere to that principle; Golden Age Stories happen during their own Topical Present Day(s).