In the book "The Day of Islam," Ahmed Amin takes us on a journey through time to explore the history of Islam and its development throughout the ages. The writer skillfully paints a comprehensive picture of the fundamentalist and legislative principles that shaped the rules of Islam, and traces their influences across various historical eras up to the present time. Through a careful examination of Islamic civilization, Amin highlights the unique human contributions that this civilization has made to the world, compared to other civilizations. The book presents an in-depth analysis of the conditions of the Islamic State, and shows how this religion and its civilization were able to shape the history of humanity. This work is not just a historical documentation, but rather a religious wealth that highlights cognitive and cultural aspects that deserve study and appreciation.