Task: Question Understanding
Input (English): Context : The 1928 Imperial Airways Vickers Vulcan crash occurred on 13 July 1928 when a Vickers Vulcan on a test flight from Croydon Airport with a pilot and five passengers crashed near Purley, Surrey three miles from the airport, with the loss of four passengers. 
Question : What is the full date that 1928 Imperial Airways Vickers Vulcan crash crashed on?
Output (English): point in time