Difference time between Guinea Bissau and Oman in hours, minutes, and seconds is [ -4 hours ] with gregorian date today is Friday 11th of September 2026 in Guinea Bissauan local time, Where the time now in Guinea Bissau is 20:10 PM and the time now in Oman is 00:10 AM in Omani local time and the time comparison between Republic of Guinea-Bissau and Oman in greenwich time ( GMT ) where Guinea Bissau advanced about greenwich time ( GMT +00:00 ) while Oman advanced about greenwich time ( GMT +04:00 ).