Ascension Island follows Greenwich Mean Time (GMT). This means that if it is 20:00 GMT (8 p.m.) during your expedition cruise to Ascension Island, it would be 16:00 (5 p.m.) in New York City, USA, 21:00 (9 p.m.) in London, U.K. and 8:00 (8 a.m.) the following morning in the Antarctic South Pole.