Yom Yerushalayim - Jerusalem Day Meaning. Jerusalem Day - 28th Iyar - marks the day in which the City of Jerusalem was united on June 5, 1967, during the Six Day War. The city had previously been left divided between Israeli and Jordanian rule following cease-fire lines in the aftermath of the War of Independence in 1948. This event was a watershed in Jewish history, as a 2000-year old dream was fulfilled and the Temple Mount, including the remnant of the Temple, the retaining Western (or Wailing) Wall was returned to Jewish sovereignty. Observance. Some celebrate the event with special prayers and readings in the synagogue. In Israel, the day is marked by national ceremonies (especially at the Wailing Wall and at Ammunition Hill - site of severe fighting during the Six-Day War), a march through Jerusalem, and entertainment at key points around the City.