Difference time between Guinea Bissau and Guyana in hours, minutes, and seconds is [ +4 hours ] with gregorian date today is Thursday 11th of September 2025 in Guinea Bissauan local time, Where the time now in Guinea Bissau is 22:14 PM and the time now in Guyana is 18:14 PM 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 ).