27 Ramadan is the Islamic date widely associated with Laylat al-Qadr in many Sunni traditions.
The Quran does not specify a numbered date for the Night of Power. Sunni teachings commonly place it among the odd-numbered nights of Ramadan’s final ten nights—especially the 21st, 23rd, 25th, 27th, or 29th. Of these, the 27th night is the most widely observed and is often treated as the leading traditional candidate.
This association does not mean every Sunni scholar considers the date certain. Reports in hadith literature encourage Muslims to search for Laylat al-Qadr throughout the last ten nights, preserving the night’s uncertainty and encouraging sustained worship rather than attention to one evening only.
The date also differs across Muslim traditions. Many Shia communities give particular importance to the 19th, 21st, and especially 23rd nights of Ramadan. The Islamic night begins at sunset, so “the 27th night” begins after sunset on the 26th day and ends at dawn on the 27th.