| Rümlang Anzola dell'Emilia | Central European Time | 00:00 |
| Rümlang Ao Nang | Indochina Time | -06:00 |
| Rümlang Aoba Ward | Japan Time | -08:00 |
| Rümlang Aoi Ward | Japan Time | -08:00 |
| Rümlang Assomada | Cape Verde Time | 02:00 |
| Rümlang Assago | Central European Time | 00:00 |
| Rümlang Asolo | Central European Time | 00:00 |
| Rümlang Atatürk Mahallesi | Turkey Time | -02:00 |
| Rümlang Athol | New Zealand Time | -12:00 |
| Rümlang Athy | Ireland Time | 01:00 |
| Rümlang Asangaon | India Standard Time | -04:30 |
| Rümlang Ascot Vale | Eastern Australia Time | -10:00 |
| Rümlang Ascoli Satriano | Central European Time | 00:00 |
| Rümlang Ascona | Central European Time | 00:00 |
| Rümlang Asendorf | Central European Time | 00:00 |
| Rümlang Ashbourne | United Kingdom Time | 01:00 |
| Rümlang Ashwood | Eastern Australia Time | -10:00 |
| Rümlang Ashprington | United Kingdom Time | 01:00 |
| Rümlang Arundel | Eastern Time | 06:00 |
| Rümlang Arvidsjaur | Central European Time | 00:00 |
| Rümlang Arruda dos Vinhos | Western European Time | 01:00 |
| Rümlang Artà | Central European Time | 00:00 |
| Rümlang Arossim | India Standard Time | -04:30 |
| Rümlang Arpora | India Standard Time | -04:30 |
| Rümlang Ardross | Western Australia Time | -07:00 |
| Rümlang Ardsley | Eastern Time | 06:00 |
| Rümlang Åre | Central European Time | 00:00 |
| Rümlang Arcugnano | Central European Time | 00:00 |
| Rümlang Arden | Eastern Time | 06:00 |
| Rümlang Ariana | Central European Time | 00:00 |
| Rümlang Argenbühl | Central European Time | 00:00 |
| Rümlang Argent-sur-Sauldre | Central European Time | 00:00 |
| Rümlang Arklow | Ireland Time | 01:00 |
| Rümlang Arkula | India Standard Time | -04:30 |
| Rümlang Arlesheim | Central European Time | 00:00 |
| Rümlang Armstrong | Pacific Time | 09:00 |
| Rümlang Arncliffe | Eastern Australia Time | -10:00 |
| Rümlang Arnedo | Central European Time | 00:00 |