Imam Ali, whose birthday is an occasion to celebrate manhood, is respected by both Sunni and Shia Muslims for his honesty, belief, courage, knowledge, loyalty to Prophet Muhammad (PBUH), and devotion to Islam. 

He was born in Kaaba in Mecca, Arabia (now Saudi Arabia), in 599 AD to Abu Talib, an uncle of Prophet Muhammad (PBUH) and Fatimah Bint Asad.

He was the first man (and the second person after the Prophet’s wife Khadijah) to convert to Islam after Prophet Muhammad (PBUH) received his divine revelation and declared Islam in public based on Allah’s order. 

Father's Day in the Persian calendar coincides with the birth anniversary of Imam Ali (PBUH) for, in Islam, parents are given high status, and the Holy Quran has frequently urged Muslims to honor, respect, and obey their parents.

Father's Day is a national holiday in Iran. Many seek ways to ways to express their gratitude and honoring their fathers on this day.

They take the opportunity to spend more time with their fathers and grandfathers, often expressing their gratitude and paying respects with flowers and gifts.