Difference time between French Guiana and Sao Tome and Principe in hours, minutes, and seconds is [ -3 hours ] with gregorian date today is Thursday 18th of June 2026 in French Guianese local time, Where the time now in French Guiana is 21:39 PM and the time now in Sao Tome and Principe is 00:39 AM in Sao Tomean local time and the time comparison between French Guiana and Sao Tome and Principe in greenwich time ( GMT ) where French Guiana late for greenwich time ( GMT -03:00 ) while Sao Tome and Principe he has the same greenwich time ( GMT +00:00 ).