From sundown on Sunday, August 11 to nightfall on Monday, August 12, 1957. 15 Av 5717 · ט״ו באב Tu B'Av (Hebrew: ט״ו באב, lit. 'fifteenth of Av') is a minor Jewish holiday. In modern-day Israel, it is celebrated as a holiday of love (חג האהבה Ḥag HaAhava), akin to Valentine's Day, and is thus a popular day for weddings. Wiki link Dates: Hebcal.com (CC BY 4.0), Diaspora schedule. Text: Wikipedia (CC BY-SA).