Father's Day is always the third Sunday in June, just as Mother's Day is always the second Sunday in May. I have no idea how those dates got picked. I suppose I could do a Google search for Father's Day and Mother's Day.
The modern American holiday of Mother's Day was first celebrated in 1908, when Anna Jarvis held a memorial for her mother in Grafton, West Virginia. Her campaign to make "Mother's Day" a recognized holiday in the United States began in 1905, the year her beloved mother, Ann Reeves Jarvis, died. Anna’s mission was to honor her own mother by continuing work she had started and to set aside a day to honor mothers, "the person who has done more for you than anyone in the world." Anna's mother, Ann Jarvis, was a peace activist who had cared for wounded soldiers on both sides of the Civil War and created Mother’s Day Work Clubs to address public health issues.
Due to the campaign efforts of Anna Jarvis, several states officially recognized Mother's Day, the first in 1910 being West Virginia, Jarvis’ home state. In 1914 Woodrow Wilson signed the proclamation creating Mother’s Day, the second Sunday in May, as a national holiday to honor mothers. In a thank-you note to Wilson, Jarvis wrote of a “great Home Day of our country for sons and daughters to honor their mothers and fathers and homes in a way that will perpetuate family ties and give emphasis to true home life.” Jarvis became critical, however, of the commercialization of the day.
Father's Day was inaugurated in the United States in the early 20th century to complement Mother's Day in celebrating fatherhood and male parenting.
After the success obtained by Anna Jarvis with the promotion of Mother's Day in the US, some[who?] wanted to create similar holidays for other family members, and Father's Day was the choice most likely to succeed.[citation needed] There were other persons in the US who independently thought of "Father's Day", but the credit for the modern holiday is often given to Sonora Dodd, who was the driving force behind its establishment.]
Father's Day was founded in Spokane, Washington at the YMCA in 1910 by Sonora Smart Dodd, who was born in Arkansas. Its first celebration was in the Spokane YMCA on June 19, 1910. Her father, the Civil War veteran William Jackson Smart, was a single parent who raised his six children there. After hearing a sermon about Jarvis' Mother's Day in 1909, she told her pastor that fathers should have a similar holiday honoring them. Although she initially suggested June 5, her father's birthday, the pastors did not have enough time to prepare their sermons, and the celebration was deferred to the third Sunday of June.