Yes this post also made me check lol - it's June 21 at least in the USA idk if it's a global thing or what not.

Yep deleted the post as soon as I posted it idk why it's showing

Third Sunday in June is most common, but Father's Day is celebrated on lots of different dates in different countries: https://en.wikipedia.org/wiki/Father%27s_Day

(Mother's Day, too, btw.)