| Guyana Bosnia and Herzegovina | Central European Time | -05:00 |
| Guyana Costa Rica | Central Time | 02:00 |
| Guyana Croatia | Central European Time | -05:00 |
| Guyana New Zealand | New Zealand Time | -17:00 |
| Guyana Lebanon | Eastern European Time | -06:00 |
| Guyana Puerto Rico | Argentina Time | -01:00 |
| Guyana Liberia | Greenwich Mean Time | -04:00 |
| Guyana Uruguay | Uruguay Time | -01:00 |
| Guyana Panama | Central Time | 02:00 |
| Guyana Mauritania | Greenwich Mean Time | -04:00 |
| Guyana Congo | West Africa Time | -05:00 |
| Guyana Albania | Central European Time | -05:00 |
| Guyana Armenia | Armenia Time | -08:00 |
| Guyana Lithuania | Eastern European Time | -06:00 |
| Guyana Jamaica | Eastern Time | 01:00 |
| Guyana Kuwait | Arabian Time | -07:00 |
| Guyana Latvia | Eastern European Time | -06:00 |
| Guyana Namibia | Central Africa Time | -06:00 |
| Guyana Botswana | Central Africa Time | -06:00 |
| Guyana Slovenia | Central European Time | -05:00 |
| Guyana Lesotho | South Africa Standard Time | -06:00 |
| Guyana The Gambia | Eastern Australia Time | -15:00 |
| Guyana Guinea-Bissau | Greenwich Mean Time | -04:00 |
| Guyana Gabon | West Africa Time | -05:00 |
| Guyana Swaziland | South Africa Standard Time | -06:00 |
| Guyana Mauritius | Mauritius Time | -08:00 |
| Guyana Estonia | Eastern European Time | -06:00 |
| Guyana Timor-Leste | East Timor Time | -13:00 |
| Guyana Equatorial Guinea | West Africa Time | -05:00 |
| Guyana Fiji | Fiji Time | -17:00 |
| Guyana Qatar | Arabian Time | -07:00 |
| Guyana Reunion | Reunion Time | -08:00 |
| Guyana Comoros | East Africa Time | -07:00 |
| Guyana Guyana | Guyana Time | 00:00 |
| Guyana Djibouti | East Africa Time | -07:00 |
| Guyana Bahrain | Arabian Time | -07:00 |
| Guyana Bhutan | Bhutan Time | -10:00 |
| Guyana Solomon Islands | Solomon Islands Time | -15:00 |
| Guyana Cape Verde | Cape Verde Time | -03:00 |
| Guyana Luxembourg | Central European Time | -05:00 |
| Guyana Suriname | Suriname Time | -01:00 |
| Guyana Guadeloupe | Atlantic Time | 00:00 |
| Guyana Martinique | Atlantic Time | 00:00 |
| Guyana Brunei | Brunei Darussalam Time | -12:00 |
| Guyana Belize | Central Time | 02:00 |
| Guyana The Bahamas | Eastern Time | 01:00 |
| Guyana Barbados | Atlantic Time | 00:00 |
| Guyana French Polynesia | Tahiti Time | 06:00 |
| Guyana French Guiana | French Guiana Time | -01:00 |
| Guyana Samoa | Apia Time | -17:00 |