Difference time between Guinea Bissau and Mongolia in hours, minutes, and seconds is [ -8 hours ] with gregorian date today is Thursday 10th of September 2026 in Guinea Bissauan local time, Where the time now in Guinea Bissau is 13:29 PM and the time now in Mongolia is 21:29 PM in Mongolian local time and the time comparison between Republic of Guinea-Bissau and Mongolia in greenwich time ( GMT ) where Guinea Bissau advanced about greenwich time ( GMT +00:00 ) while Mongolia advanced about greenwich time ( GMT +08:00 ).