Difference time between Guinea Bissau and Guyana in hours, minutes, and seconds is [ +4 hours ] with gregorian date today is Thursday 10th of September 2026 in Guinea Bissauan local time, Where the time now in Guinea Bissau is 13:02 PM and the time now in Guyana is 09:02 AM in Guyanese local time and the time comparison between Republic of Guinea-Bissau and Guyana in greenwich time ( GMT ) where Guinea Bissau advanced about greenwich time ( GMT +00:00 ) while Guyana late for greenwich time ( GMT -04:00 ).