It is celebrated according to the Islamic lunar calendar, usually on the 10th of Zul Hijjah, which is the 12th or last month of the Islamic calendar.

Source: https://www.ibtimes.co.in/eid-al-adha-2023-gauahar-khans-son-zehaan-gets-jaanamaz-topi-dad-zaid-he-celebrates-his-first-860352

"Registering for this year's Hajj will only be for pilgrims who have Saudi ID, or valid residency (Iqama) during the registering period which will expire in the 17th of the month of Dhul Hijjah 1444", the Ministry said.

Source: https://ummid.com/news/2023/january/16.01.2023/saudi-hajj-ministry-issues-new-guidelines-for-gcc-nationals-repeater-mehram.html