Difference time between Guinea Bissau and United States of America in hours, minutes, and seconds is [ +4 hours ] with gregorian date today is Saturday 21st of March 2026 in Guinea Bissauan local time, Where the time now in Guinea Bissau is 00:46 AM and the time now in United States of America is 20:46 PM in American local time and the time comparison between Republic of Guinea-Bissau and United States of America in greenwich time ( GMT ) where Guinea Bissau advanced about greenwich time ( GMT +00:00 ) while United States of America late for greenwich time ( GMT -04:00 ).