Ceremonies and Parades - Setting the country's clocks ahead one hour. Marcus M. Marks, Chairman of the National Daylight Saving Movement, giving the signal to set the hands of the great clock in the Metropolitan Tower, N. Y. City, ahead one hour. The signal was given at exactly 2 A.M. Sunday March 31, 1918 at Aldine Club, on a signal from Washington, D.C

Chicago citation style
War Department. 1789-9/18/1947. Ceremonies and Parades - Setting the country's clocks ahead one hour. Marcus M. Marks, Chairman of the National Daylight Saving Movement, giving the signal to set the hands of the great clock in the Metropolitan Tower, N. Y. City, ahead one hour. The signal was given at exactly 2 A.M. Sunday March 31, 1918 at Aldine Club, on a signal from Washington, D.C. 1917-01-01/1918-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/23923627. (Accessed October 16, 2018.)
APA citation style
War Department. 1789-9/18/1947, (1917-01-01/1918-12-31) Ceremonies and Parades - Setting the country's clocks ahead one hour. Marcus M. Marks, Chairman of the National Daylight Saving Movement, giving the signal to set the hands of the great clock in the Metropolitan Tower, N. Y. City, ahead one hour. The signal was given at exactly 2 A.M. Sunday March 31, 1918 at Aldine Club, on a signal from Washington, D.C. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/23923627
MLA citation style
War Department. 1789-9/18/1947. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/23923627>.
Note: These citations are programmatically generated and may be incomplete.