Why can't they learn? Why do they keep have to specify years! I don't know why fans except Marvel being on a sliding time frame, and not DC (I think it has something to do with their WWII-era characters having been more popular), but they do!
DC keeps saying what 'years' things happen in. Then people hit the internet showing how insane the math is on certain thing.
If anyone from DC at NYCC is reading: QUICK! Just specify 1938, then list everything else as "A short time after that" or "Some time later"! STOP being so specific! It's part of why you have to reboot so much! You can't cram 80 years of still going continuity into a decade! Don't be specific and we will fill in the blanks for ourselves!