Well, as far as I know Whedon was using the screenplay for the movie rather than the movie itself as a semi-guideline. Like I said, I have an old TV Guide in which Joss decides (whether it was off-the-cuff decision) that Buffy's "official" birthday is January 19th. However, on the show, during "I Robot, You Jane," Buffy's school records are shown on the computer, listing her birthdate as "October 24, 1980." And then later, in S3, when her records are once again pulled up, the birthdate is changed to "May 6, 1979." I can wank those as clerical errors. However, Buffy says that she's "a Capricorn on the cusp of Aquarius" which would put her birthday a little bit later in January, unless she's just being glib in her response. Still, that means there's a whole host of possible dates in there.
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Date: 2012-02-12 11:03 pm (UTC)