1840 C. J. Tyers p. xiii 23 h. 21 m. 26 s. G.M.T.
1928 W. M. Smart iv. 49 The true Greenwich Mean Time (G.M.T.).
2013 18 Sept. 23/1 The cruise liner finally jolted upright at 4am local time (2am GMT) and salvage crews celebrated with bottles of beer.