Why Does the Eid ul-Adha Date Change Each Year?
Both Eid and all of the key dates in the Islamic calendar change by around 10 days each year. This is because the Islamic calendar is based on lunar cycles rather than those of the sun, and lunar calendars tend to be 10-11 days shorter than solar ones. As a result, Eid ul-Adha, Ramadan, Eid ul-Fitr, and many more major events have different dates from year to year.
Staying aware of these changing dates is a key part of Muslim life as it is essential to complete religious obligations at the correct times. The team at UK Islamic Mission strives to assist you where possible, whether it is through our prayer timetable or informative content on the most important beliefs of Islam.
The Islamic calendar, which is considered to have been created by Khalifa Umar ibn Al-Khattab, begins from the year 622 AD in the Gregorian calendar, which is the year of the Prophet Muhammad’s (PBUH) migration from Mecca to Medina. It was not immediately decided that this should mark the beginning of the Islamic calendar, with some suggesting that the Prophet’s (PBUH) date of birth should be its beginning, while others recommended the date of Muhammad’s (PBUH) death.
It was only after Khalifa Umar sought the opinion of Uthman ibn Affan and Ali bin Abi Talib, two of the Prophet’s (PBUH) most trusted companions, that it was decided the migration would mark the beginning of the Islamic calendar.