:salam2:
While Eid ul-Adha is always on the same day of the Islamic calendar, the date on the Gregorian calendar varies from year to year since the Islamic calendar is a lunar calendar and the Gregorian calendar is a solar calendar. The Lunar calendar is approximately eleven days shorter than the Solar calendar.Each year, Eid ul-Adha (like other Islamic holidays) falls on one of two different Gregorian dates in different parts of the world, due to the fact that the boundary of crescent visibility is different from the International date line.
For Saudi Arabia,
1429 (Islamic Calendar): December 8, 2008 (calculated)