From the Colmar mairie scene in Act II:

You heard me, young man. The twelfth August, 1503... - Remilia's birthday, as mentioned here, is not canonical; as far as I know, Touhou characters don't have officially established birthdates. I arrived at this date solely because while I was writing that scene, I was listening to "The Eve of the War" from Jeff Wayne's Musical Version of The War of the Worlds—in which the Journalist mentions that the first Martian cylinder was launched "at midnight on the twelfth of August".

--G.
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Benjamin D. Hutchins, Co-Founder, Editor-in-Chief, & Forum Mod
Eyrie Productions, Unlimited http://www.eyrie-productions.com/
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Ceterum censeo Carthaginem esse delendam.