Shaykh Abdul Qadir Jelani said in Ghuniya tul Talibeen vol 2 page 317, while quoting the virtues of Ashura i.e. 10th of Muharram,
“In it Our Prophet Muhammad peace be upon him was born.”
Whereas, Ahmad Raza Khan Brailwi mentioned Shaykh Abdul Qadir jelani knows everything from begenning to ending, as he quoted the words of Shaykh Jilani ra from Qaseeda Gawthiya (which is falsely attributed to him by Ahmad Raza Khan) in his Malfuzat
“I have seen all the cities of Allah like a small piece” (Ahmad raza commented) And this seeing was not specific to some time rather this hukm is continuous. And he (Jilani ra) said “My eyes are looking Lawh al Mahfooz (preserved tablet)” (Ahmad Raza commented) What is Lawh al Mahfooz? Allah says “And everything they did is in written records” and Allah says “We have not neglected in the Register a thing” and Allah says ” and no moist or dry [thing] but that it is [written] in a clear record” (Ahmad Raza commented) When this is place of Lawh al Mahfooz that in it, It is written the happenings of whole of universe from the first day to the last so whoever knows the knowledge of it, Indeed he has the knowledge of whole of universe [Malfuzat e Ala Hazrat urdu edition pages 29-30]
If this is true than they should celebrate Mawlid on 10th of Muharram. It is either Shaykh Abdul Qadir did not know knowledge of unseen or Prophet peace be upon him was born on 10th of Muharram and not on 12th of Rabi ul Awwal.