| Guyana São Tomé and Príncipe | Greenwich Mean Time | -04:00 |
| Guyana Saint Lucia | Atlantic Time | 00:00 |
| Guyana Mayotte | East Africa Time | -07:00 |
| Guyana U.S. Virgin Islands | Atlantic Time | 00:00 |
| Guyana Saint Vincent and the Grenadines | Atlantic Time | 00:00 |
| Guyana Seychelles | Pacific Time | 04:00 |
| Guyana Antigua and Barbuda | Newfoundland Time | -00:30 |
| Guyana Andorra | Central European Time | -05:00 |
| Guyana Dominica | Atlantic Time | 00:00 |
| Guyana Aruba | Atlantic Time | 00:00 |
| Guyana Marshall Islands | Marshall Islands Time | -16:00 |
| Guyana Bermuda | Eastern Time | 01:00 |
| Guyana American Samoa | Samoa Time | 07:00 |
| Guyana Greenland | West Greenland Time | -01:00 |
| Guyana Northern Mariana Islands | Chamorro Standard Time | -14:00 |
| Guyana Saint Kitts and Nevis | Atlantic Time | 00:00 |
| Guyana Faroe Islands | Western European Time | -04:00 |
| Guyana Cayman Islands | Malaysia Time | -12:00 |
| Guyana Monaco | Central European Time | -05:00 |
| Guyana Gibraltar | Central European Time | -05:00 |
| Guyana Montserrat | United Kingdom Time | -04:00 |
| Guyana Saint Helena | Eastern Time | 01:00 |
| Guyana Saint Pierre and Miquelon | Reunion Time | -08:00 |
| Guyana Falkland Islands (Islas Malvinas) | United Kingdom Time | -04:00 |
| Guyana Norfolk Island | Eastern Time | 01:00 |