International Fathers' Day is celebrated this year on Sunday, June 21st.

According to Wikipedia:

"In Taiwan, Father's Day is not an official holiday, but is widely observed on August 8, the eighth day of the eighth month of the year. In Mandarin Chinese, the pronunciation of the number 8 is bā. This pronunciation is very similar to the character "爸" "bà", which means "Papa" or "father". The Taiwanese, therefore, usually call August 8 by its nickname, "Bābā Day" (爸爸節)."