Approximately 70 days separate Eid al-Fitr and Eid al-Adha in the Islamic calendar.
Eid al-Fitr occurs on 1 Shawwal, immediately after Ramadan. Eid al-Adha occurs on 10 Dhu al-Hijjah, during the final month of the Islamic year. Counting through Shawwal, Dhu al-Qadah, and the first ten days of Dhu al-Hijjah gives the familiar interval of about 70 days.
The exact number of days can vary because Islamic months begin with the sighting or calculated determination of the new crescent, and lunar months have either 29 or 30 days. The two festivals therefore are conventionally described as about ten weeks apart rather than as a fixed Gregorian-calendar interval.
The festivals have different themes: Eid al-Fitr marks the completion of Ramadan fasting, while Eid al-Adha is associated with the Hajj season and the sacrifice commemorated by Muslims worldwide.