| Sigulda Conshohocken | Eastern Time | 07:00 |
| Sigulda Constantine | United Kingdom Time | 02:00 |
| Sigulda Crescent Springs | Eastern Time | 07:00 |
| Sigulda Cremorne | Eastern Australia Time | -07:00 |
| Sigulda Crestview Hills | Eastern Time | 07:00 |
| Sigulda Conthey | Central European Time | 01:00 |
| Sigulda Carhaix-Plouguer | Central European Time | 01:00 |
| Sigulda Cardona | Central European Time | 01:00 |
| Sigulda Cardonville | Central European Time | 01:00 |
| Sigulda Cardiff | Eastern Australia Time | -07:00 |
| Sigulda Cardigan | United Kingdom Time | 02:00 |
| Sigulda Caraz | Peru Time | 08:00 |
| Sigulda Cárcar | Central European Time | 01:00 |
| Sigulda Carbis Bay | United Kingdom Time | 02:00 |
| Sigulda Carleton Place | Eastern Time | 07:00 |
| Sigulda Carle Place | Eastern Time | 07:00 |
| Sigulda Carlingford | Ireland Time | 02:00 |
| Sigulda Carlin | Pacific Time | 10:00 |
| Sigulda Carlton | Eastern Australia Time | -07:00 |
| Sigulda Carlton North | Eastern Australia Time | -07:00 |
| Sigulda Carmel-by-the-Sea | Pacific Time | 10:00 |
| Sigulda Carnac | Central European Time | 01:00 |
| Sigulda Carnforth | United Kingdom Time | 02:00 |
| Sigulda Chendamangalam | India Standard Time | -02:30 |
| Sigulda Chelsea | Eastern Time | 07:00 |
| Sigulda Chemainus | Pacific Time | 10:00 |
| Sigulda Chennai | India Standard Time | -02:30 |
| Sigulda Chennai | India Standard Time | -02:30 |
| Sigulda Chennai | India Standard Time | -02:30 |
| Sigulda Chengdu | China Time | -05:00 |
| Sigulda Caroline Springs | Eastern Australia Time | -07:00 |
| Sigulda Chauth Ka Barwara | India Standard Time | -02:30 |
| Sigulda Chavakachcheri | India Standard Time | -02:30 |
| Sigulda Carole Park | Eastern Australia Time | -07:00 |
| Sigulda Carolina Beach | Eastern Time | 07:00 |
| Sigulda Chelan | Pacific Time | 10:00 |
| Sigulda Chehalis | Pacific Time | 10:00 |
| Sigulda Cheddar | United Kingdom Time | 02:00 |