Difference time between Guyana and Mauritania in hours, minutes, and seconds is [ -4 hours ] with gregorian date today is Friday 19th of September 2025 in Guyanese local time, Where the time now in Guyana is 00:31 AM and the time now in Mauritania is 04:31 AM in Mauritanian local time and the time comparison between Co-operative Republic of Guyana and Mauritania in greenwich time ( GMT ) where Guyana late for greenwich time ( GMT -04:00 ) while Mauritania he has the same greenwich time ( GMT +00:00 ).