Difference time between United States of America and Guinea Bissau in hours, minutes, and seconds is [ -4 hours ] with gregorian date today is Saturday 13th of September 2025 in American local time, Where the time now in United States of America is 17:08 PM and the time now in Guinea Bissau is 21:08 PM in Guinea Bissauan local time and the time comparison between United States of America and Guinea Bissau in greenwich time ( GMT ) where United States of America late for greenwich time ( GMT -04:00 ) while Guinea Bissau he has the same greenwich time ( GMT +00:00 ).