The Titan II GLV (Gemini Launch Vehicle) or Gemini-Titan II was an American expendable launch system derived from the Titan II missile, which was used to launch twelve Gemini missions for NASA between 1964 and 1966. Two unmanned launches followed by ten manned ones were conducted from Launch Complex 19 at the Cape Canaveral Air Force Station, starting with Gemini 1 on April 8, 1964.WIKI
Gemini 5 was the third crewed mission of the NASA's Project Gemini. The mission was commanded by Command Pilot L. Gordon Cooper, Jr. and Pilot Charles "Pete" Conrad, Jr. The mission began on August 21, 1965, 13:59:59 UTC and ended on August 29, 1965, 12:55:13 UTC.
NET: August 21st 1965 - 13:59 UTC
Instantaneous launch window.