In the United States, Tax Day is the day on which individual income tax returns are due to be submitted to the federal government. Since 1955, Tax Day has typically fallen on or just after April 15. Tax Day was first introduced in 1913, when the Sixteenth Amendment was ratified.. The date is delayed if it conflicts with a weekend or public holiday such as Emancipation Day.

Hangar 18 may refer to: . Hangar 18, a hangar at the Wright-Patterson Air Force Base in Ohio purported to contain UFO (Unidentified Flying Object) technology; Hangar 18 (band), an American hip hop group Hangar 18, a 1980 science fiction film "Hangar 18" (song), a song by Megadeth from Rust in Peace "Hangar 18, Area 51", a song by Yngwie Malmsteen from the 1999 album …