When did Prophet Muhammad die( Peace, Blessings and Mercy of Allah be upon him) ?
What is the authentic, correct and exact date of death of Prophet Muhammad ( Peace, Blessings and Mercy of Allah be upon him)
There is disagreement and difference of opinion among scholars about date of death of Prophet Muhammad ( Peace, Blessings and Mercy of Allah be upon him)
1. The majority are of the view that it occurred on 12th Rabee‘ al-Awwal.
2. al-Khawarizmi was of the view that it occurred on 1st Rabee‘ al-Awwal.
3. Ibn al-Kalbi and Abu Makhnaf were of the view that it occurred on 2nd Rabee‘ al-Awwal. As-Suhayli was inclined to favour this view and al-Hafiz Ibn Hajar (may Allah have mercy on him) regarded it as most likely to be correct.
The most well-known view is that of the majority, which is that the death of the Prophet (blessings and peace of Allah be upon him) occurred on 12th Rabee‘ al-Awwal 11 AH.
Refer Complete Answer for more clarification and understanding
https://islamqa.info/en/answers/147601/what-is-the-date-of-prophet-muhammads-birth-and-death