| Grenchen Kakkanad | India Standard Time | -03:30 |
| Grenchen Richmond | Eastern Time | 06:00 |
| Grenchen Monchique | Western European Time | 01:00 |
| Grenchen Wauchope | Eastern Australia Time | -08:00 |
| Grenchen Alverca do Ribatejo | Western European Time | 01:00 |
| Grenchen Wang Maprang Nuea | Indochina Time | -05:00 |
| Grenchen Quiringuicharo | Central Time | 07:00 |
| Grenchen tp. Thanh Hoá | Indochina Time | -05:00 |
| Grenchen Kalamazoo Township | Eastern Time | 06:00 |
| Grenchen Sângeorgiu de Mureș | Eastern European Time | -01:00 |
| Grenchen Monastero Bormida | Central European Time | 00:00 |
| Grenchen Skanderborg | Central European Time | 00:00 |
| Grenchen Alvor | Western European Time | 01:00 |
| Grenchen Wandiligong | Eastern Australia Time | -08:00 |
| Grenchen Quinns Rocks | Western Australia Time | -06:00 |
| Grenchen tp. Tuy Hòa | Indochina Time | -05:00 |
| Grenchen Kalady | India Standard Time | -03:30 |
| Grenchen Saint-Martin-de-Belleville | Central European Time | 00:00 |
| Grenchen Monastier di Treviso | Central European Time | 00:00 |
| Grenchen Skaneateles | Eastern Time | 06:00 |
| Grenchen Alzenau | Central European Time | 00:00 |
| Grenchen Wamego | Central Time | 07:00 |
| Grenchen Quinta do Conde | Western European Time | 01:00 |
| Grenchen Trebče | Central European Time | 00:00 |
| Grenchen Kalahastipura | India Standard Time | -03:30 |
| Grenchen Saint-Marcel-Campes | Central European Time | 00:00 |
| Grenchen Monreal del Campo | Central European Time | 00:00 |
| Grenchen Skagway | Alaska Time | 10:00 |
| Grenchen Amarante | Western European Time | 01:00 |
| Grenchen Wanaka | New Zealand Time | -10:00 |
| Grenchen Quintanar de la Orden | Central European Time | 00:00 |
| Grenchen Trenzano | Central European Time | 00:00 |
| Grenchen Matamata | New Zealand Time | -10:00 |
| Grenchen Saint Margrethen | Central European Time | 00:00 |
| Grenchen Monona | Central Time | 07:00 |
| Grenchen Skiathos | Eastern European Time | -01:00 |
| Grenchen Amaravati | India Standard Time | -03:30 |
| Grenchen Walzbachtal | Central European Time | 00:00 |
| Grenchen Wynn Vale | Central Australia Time | -07:30 |
| Grenchen Tremonton | Mountain Time | 08:00 |
| Grenchen Mitzpe Ramon | Israel Time | -01:00 |
| Grenchen Saint Leonards | Eastern Australia Time | -08:00 |
| Grenchen Monkton | Eastern Time | 06:00 |
| Grenchen Skiatook | Central Time | 07:00 |
| Grenchen Amakusa | Japan Time | -07:00 |
| Grenchen Wals | Central European Time | 00:00 |
| Grenchen Wynnewood | Eastern Time | 06:00 |
| Grenchen Trevescan | United Kingdom Time | 01:00 |
| Grenchen Mittenwald | Central European Time | 00:00 |
| Grenchen Saint Leonards | United Kingdom Time | 01:00 |