The "Night of Power" Laylat al Qader (revelation of Qur'an) - August 23 or 26 this year

August 26

Laylat al Qader (Islam)
Meaning loosely "the night of power," this is identified as the night in which Allah first revealed the Qur’an to the Prophet Muhammad. It is believed that this day holds more power in prayer than a thousand months; thus many Muslims spend the whole day in prayer and reading the Qur’an. Sunni Muslims traditionally observe Laylat al Qader on the 27th day of Ramadan, while Shi’as believe the 23rd day to be the most important. Since the specific day of the revelation is uncertain, many Muslims spend the last 10 days of Ramadan focused on prayer.