Difference time between Guinea Bissau and Singapore in hours, minutes, and seconds is [ -8 hours ] with gregorian date today is Saturday 21st of March 2026 in Guinea Bissauan local time, Where the time now in Guinea Bissau is 00:38 AM and the time now in Singapore is 08:38 AM in Singaporean local time and the time comparison between Republic of Guinea-Bissau and Singapore in greenwich time ( GMT ) where Guinea Bissau advanced about greenwich time ( GMT +00:00 ) while Singapore advanced about greenwich time ( GMT +08:00 ).