Buffy Summers' Birthday!
august > January 19th, 2008, 04:13 PM
No, not Sarah Michelle Gellar's but rather the character Buffy's!
In the 4th season ep "Doomed" (the one right after "Hush," when Buffy and Riley 'fess up to each other, then have to work together along w/ Spike - wearing Xander's clothes - to stop those 3 demons from diving into the still active Hellmouth under the ruins of Sunnydale High) she tells Riley that she's a "Capricorn on the cusp of Aquarius."
That apparently means her birthday is somewhere between the 17th and the 20th of January. And in fact when we saw her birthday celebrated on the show, the eps usually aired that very week. Although another site defined the cusp as January 19 to January 23. As a kid, I always heard "cusp" defined as literally the day before, as I was born a Virgo, but on the cusp of Libra, i.e. Sept. 22nd, just before it becomes Libra. By that definition, then today, the 19th, is indeed the day!