The exact date of Al-Israa’ and Al-Mi`raj is not known. There is no evidence to support the saying that it happened on 27th of Rajab. Even if 27th of Rajab is the day of Al-Israa’ and Al-Mi`raj, there is no way to say that we have to fast that day, since we cannot innovate fasting on our own without having evidence from the sources of Shari`ah supporting it.

Among the prohibited types of fasting is any kind of fasting people initiate on their own without any Shari`ah text or evidence. An example of this is the fasting on the 27th of Rajab thinking that it is the day that followed the night of Al-Israa’ and Al-Mi`raj.