EL PASO, Texas (KTSM) — Celebrating 915 Day in style. Oliver is celebrating 915 Day with his Texas 915 onesie. Photo courtesy to the Hospitals of Providence. The Hospitals of Providence is celebrating 915 Day with baby Oliver, who was born Sept. 14, according to the hospital. Oliver was dressed in a Texas 915 Day onesie as part of the festivities in the Sun City. The Las Palmas Del Sol Healthcare also dressed up their newborns for 915 Day. 915 babies were born on 9/15 in Las Palmas Del Sol Healthcare. Photos courtesy to Las Palmas Del Sol Healthcare. 915 Day -- Sept. 15 -- is a fun way to celebrate El Paso.