28th of Safar, Prophet's passing anniversary

What is significance of 28th of Safar from Imam Khomeini’s views?

A mourning ceremony at Imam Khomeini’s mausoleum marked 28th of Safar

on the occasion of the passing anniversary of the honorable prophet of Islam and martyrdom of his infallible grandson Imam Hassan (PBUT)

Universal message of the holy prophet of Islam

The anniversary of passing away of Prophet Mohammed and Martrydom of Imam Hasan is marked on 28th of Safar.