Difference time between Guyana and Guinea Bissau in hours, minutes, and seconds is [ -4 hours ] with gregorian date today is Friday 19th of September 2025 in Guyanese local time, Where the time now in Guyana is 00:34 AM and the time now in Guinea Bissau is 04:34 AM in Guinea Bissauan local time and the time comparison between Co-operative Republic of Guyana and Guinea Bissau in greenwich time ( GMT ) where Guyana late for greenwich time ( GMT -04:00 ) while Guinea Bissau he has the same greenwich time ( GMT +00:00 ).