Countdown
A live countdown to Father's Day, calculated from the actual rule — the 3rd Sunday of June in the US and most countries that observe it on this date.
Father's Day was first celebrated in the US in 1910, inspired directly by the Mother's Day model — but unlike Mother's Day, it wasn't officially made a permanent national observance until 1972, when President Nixon signed it into law. For over 60 years in between, it existed as an unofficial, inconsistently observed date, partly because it was initially seen (and sometimes mocked) as a commercially-driven copy of the already-established Mother's Day.
Most countries that celebrate a Father's Day use the same 3rd-Sunday-of-June rule as the US, but several — including large parts of Europe and Latin America — instead observe it on March 19 (Saint Joseph's Day) or another fixed, country-specific date tied to local religious or cultural tradition.
Related
The equivalent US countdown, 2nd Sunday of May.
The exact logic behind this date, for any similar rule.
A countdown to any other custom date.