Fatima, the only daughter of the Holy prophet of Islam, was born in Mecca on 20 Th. Jumadi al- thani 18 BH. The good and noble lady Khadijah and the apostle of Allah bestowed all their natural love, care and devotion on their lovable and only child Fatima, who in her turn was extremely fond of her parents. The princess of the House of the Prophet was very intelligent, accomplished and cheerful. Her sermons, poems and sayings serve, as an index to her strength of character and nobility of mind. Her virtues gained her the title "Our Lady of light", which caused her to be called "Al-Zahra" (the Lady of Light).
The Holy Prophet (saw) said, "Fatima is a peace of my heart". Fatima (sa) was very generous; and none who come to her door, went away empty handed. She never asked Ali for anything in her whole life. In her lifetime, she was a complete woman, being Daughter, wife and Mother at the same time.
Lady Fatima martyred in the prime of her life at the age of eighteen. There is one narration with 2 interpretations that the demise of Fatima Zahra (sa) occurred either 75 days or 95 days after demise of Prophet Muhammad (saw). As we know 28th Safar is the day of demise of Prophet Muhammad (saw). So, if it was 75 days assuming that Safar, Rabi al-Awwal, Rabi al-Thani, Jamadi Al-Awwal could be 30 days so 75 days would 13th, 14th or 15th of Jamadi Al-Awwal.
And as for 95 days count then Shahadat falls on the 3rd Jamadi al-Thani. Because we do not know the exact date we call this period between 13th, 14th, 15th Jamadi Al-Awwal to 3rd Jamadi al-Thani as Ayyame Fatimiyya, reported CINVU.