Difference time between French Guiana and Vietnam in hours, minutes, and seconds is [ -10 hours ] with gregorian date today is Saturday 25th of October 2025 in French Guianese local time, Where the time now in French Guiana is 11:57 AM and the time now in Vietnam is 21:57 PM in Vietnamese local time and the time comparison between French Guiana and Vietnam in greenwich time ( GMT ) where French Guiana late for greenwich time ( GMT -03:00 ) while Vietnam advanced about greenwich time ( GMT +07:00 ).