1850 Mar. 210/2 At least an hour ahead of time.
1884 J. Habberton xxi. 147 Trains are never ahead of time.
1946 Sept. 256 Noone knows ahead of time how they will be affected.
1965 A. J. P. Taylor viii. 272 Henderson..secured the withdrawal of Allied troops from the Rhineland five years ahead of time.
2006 L. Stack iii. 111 Keep a list of things to do ahead of time.