Rotterdam is the second-largest city in the Netherlands and one of the busiest ports in the world.
| Sunrise: | 05:45 |
| Sunset: | 21:32 |
| Transit: | 13:38 |
| Civil twilight | begin 05:03 | end 22:14 |
| Nautical twilight | begin 04:03 | end 23:14 |
| Astronomical twilight | begin 02:24 | end 00:53 |
| Day | Sunrise | Sunset | |
| Mon | (18 May 2026) | 05:44 | 21:33 |
| Tue | (19 May 2026) | 05:42 | 21:35 |
| Wed | (20 May 2026) | 05:41 | 21:36 |
| Thu | (21 May 2026) | 05:40 | 21:38 |
| Fri | (22 May 2026) | 05:38 | 21:39 |
| Sat | (23 May 2026) | 05:37 | 21:40 |
| Sun | (24 May 2026) | 05:36 | 21:42 |
| Latitude: | 51°55' North |
| Longitude: | 4°28' East |
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Greenwich Mean Time (GMT) is originally referring to mean solar time at the Royal Observatory in Greenwich, London. GMT and Coordinated Universal Time (UTC) can be seen equivalent when fractions of a second are not important. |