| Semnan Tadoussac | Eastern Time | 08:30 |
| Semnan Wayne | Eastern Time | 08:30 |
| Semnan Tahoe City | Pacific Time | 11:30 |
| Semnan Waynesville | Eastern Time | 08:30 |
| Semnan Takengon | Western Indonesia Time | -02:30 |
| Semnan Wayville | Central Australia Time | -05:00 |
| Semnan Taizhou | China Time | -03:30 |
| Semnan Wayzata | Central Time | 09:30 |
| Semnan Taipa | China Time | -03:30 |
| Semnan Wasserburg am Inn | Central European Time | 02:30 |
| Semnan Taito | Japan Time | -04:30 |
| Semnan Washington | Eastern Time | 08:30 |
| Semnan Taitō-ku | Japan Time | -04:30 |
| Semnan Washington | Eastern Time | 08:30 |
| Semnan Zahara de los Atunes | Central European Time | 02:30 |
| Semnan Wasilla | Alaska Time | 12:30 |
| Semnan Zachary | Central Time | 09:30 |
| Semnan Wasaga Beach | Eastern Time | 08:30 |
| Semnan Yvoir | Central European Time | 02:30 |
| Semnan Watertown | Eastern Time | 08:30 |
| Semnan Yzeure | Central European Time | 02:30 |
| Semnan Waterloo | United Kingdom Time | 03:30 |
| Semnan Yunquera de Henares | Central European Time | 02:30 |
| Semnan Waterford | Eastern Australia Time | -05:30 |
| Semnan Yuo | West Africa Time | 03:30 |
| Semnan Waterford Township | Eastern Time | 08:30 |
| Semnan White City | Pacific Time | 11:30 |
| Semnan White Hall | Central Time | 09:30 |
| Semnan White Lake charter Township | Eastern Time | 08:30 |
| Semnan Whitby | United Kingdom Time | 03:30 |
| Semnan Whitby | Eastern Time | 08:30 |
| Semnan Whitchurch | United Kingdom Time | 03:30 |
| Semnan Wheaton-Glenmont | Eastern Time | 08:30 |
| Semnan Whitefish | Mountain Time | 10:30 |
| Semnan Whiteman Air Force Base | Central Time | 09:30 |
| Semnan Whitesboro | Eastern Time | 08:30 |
| Semnan Whiteville | Eastern Time | 08:30 |
| Semnan Whitewater | Central Time | 09:30 |