| Summerside Edithvale | Eastern Australia Time | -13:00 |
| Summerside David | Eastern Time | 02:00 |
| Summerside Edgware | United Kingdom Time | -04:00 |
| Summerside Ferozepur | India Standard Time | -08:30 |
| Summerside Edinboro | Eastern Time | 01:00 |
| Summerside David City | Central Time | 02:00 |
| Summerside Corinth | Central Time | 02:00 |
| Summerside El Bouni | Central European Time | -04:00 |
| Summerside Corella | Central European Time | -05:00 |
| Summerside Davos | Central European Time | -05:00 |
| Summerside Corfu | Eastern European Time | -06:00 |
| Summerside Egina | Eastern European Time | -06:00 |
| Summerside Coromandel | New Zealand Time | -15:00 |
| Summerside Duhamel | Eastern Time | 01:00 |
| Summerside Corolla | Eastern Time | 01:00 |
| Summerside Egerkingen | Central European Time | -05:00 |
| Summerside Corning | Eastern Time | 01:00 |
| Summerside Dumbrăvița | Eastern European Time | -06:00 |
| Summerside Cornville | Mountain Time | 04:00 |
| Summerside Eggenfelden | Central European Time | -05:00 |
| Summerside Cornwall-on-Hudson | Eastern Time | 01:00 |
| Summerside Dumfries | Eastern Time | 01:00 |
| Summerside Cornwall | Eastern Time | 01:00 |
| Summerside Egelsbach | Central European Time | -05:00 |
| Summerside Cordele | Eastern Time | 01:00 |
| Summerside Dulwich Hill | Eastern Australia Time | -13:00 |
| Summerside Coquille | Pacific Time | 04:00 |
| Summerside Die | Central European Time | -05:00 |
| Summerside Copacabana | Bolivia Time | 01:00 |
| Summerside Duloe | United Kingdom Time | -04:00 |
| Summerside Coppengrave | Central European Time | -05:00 |
| Summerside Dianella | Western Australia Time | -11:00 |
| Summerside Copley | Eastern Time | 01:00 |
| Summerside Durango | Central Time | 02:00 |
| Summerside Coonoor | India Standard Time | -08:30 |
| Summerside Dibden Purlieu | United Kingdom Time | -04:00 |
| Summerside Coogee | Eastern Australia Time | -13:00 |
| Summerside Durbuy | Central European Time | -05:00 |
| Summerside Coopers Plains | Eastern Australia Time | -13:00 |
| Summerside Diboll | Central Time | 02:00 |
| Summerside Coopersburg | Eastern Time | 01:00 |
| Summerside Durağan | Turkey Time | -06:00 |
| Summerside Cooperstown | Eastern Time | 01:00 |
| Summerside Dickson | Eastern Australia Time | -13:00 |
| Summerside Cooranbong | Eastern Australia Time | -13:00 |
| Summerside Dunster | United Kingdom Time | -04:00 |
| Summerside Coorparoo | Eastern Australia Time | -13:00 |
| Summerside Dickson City | Eastern Time | 01:00 |
| Summerside Denville | Eastern Time | 01:00 |
| Summerside Dundrum | United Kingdom Time | -04:00 |