I know I've brought the topic up before but can anyone help me with some fact checking on release dates? I saw one source say Sonic was released in June 91. Yet Sonic the Hedgehog Day is November 23rd... I always thought it was released later in the year.

Wikipedia says Link to the Past was released on April 23rd. EGM says March. I always assumed April. But how are they getting a specific date?

I assume the best evidence we can come by would be store catalogs but good luck finding those. An article on The SNES release date says newspapers and magazines said August 23rd which I believe but then other sources give other dates.