Here are the B-Days of the cast of Buffy/Angel.
 

                   Buffy's B-Day- April 14
                    Angels B-Day- May 16
                        Tara's B-Day-January 8
                         Cordelias B-Day- July 23
                         Willow's B-Day- March 24
                         Xander's B-Day- April 12
                         Anya's B-Day- April 18
                        Dawn's B-Day- October 11
                         Spikes B-Day- Augest 20
                        Giles' B-Day- Febuary 20
                         Oz's B-Day- Febuary 8
                        Gunn's B-Day- Augest 28
                         Wesly's B-Day- Febuary 25
                        Riley's B-Day- January 11
                         Faith's B-Day- December 30