- 1979
- May
- May 6, 1979
- Buffy Summers born. (Season 1 episode I, Robot... You, Jane)
- 1980
- October
- October 24, 1980
- Buffy Summers born. (Season 1 episode I, Robot... You, Jane)
- 1998
- January
- January 19, 1998
- Buffy Summers' 17th birthday. The Scooby Gang holds a surprise party at the Bronze, but is interrupted by the impending threat of the Judge. (Season 2 episode Surprise)
- 1999
- January
- January 19, 1999
- Buffy Summers' 18th birthday. Buffy's father Hank Summers breaks their tradition of going together to watch the Ice Capades. Buffy is stripped of her Slayer powers in preparation for the Tento di Cruciamentum, which ends up causing her mother Joyce Summers to be kidnapped by Zachary Kralik. (Season 3 episode Helpless)
- 2000
- January
- January 19, 2000
- Buffy Summers' 19th birthday. After Buffy's birthday party, Giles is transmogrified into a Fyarl demon by Ethan Rayne, causing Buffy to stab and almost kill him by mistake. (Season 4 episode A New Man)
- 2001
- January
- January 19, 2001
- Buffy Summers' 20th birthday. Buffy's sister Dawn Summers discovers her origin as the Key, and has a subsequent identity crisis during Buffy's birthday party. (Season 5 episode Blood Ties)
- 2002
- January
- January 19, 2002
- Buffy Summers' 21st birthday. All of the participants of Buffy's birthday party gets trapped inside the Summers residence by Dawn's wish to Halfrek. (Season 6 episode Older and Far Away)
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