Time difference between Castle Rock and London
London is 7 hours ahead of Castle Rock.
Local time in both cities
Castle Rock · United States
17:03
London · United Kingdom
00:03
London is 7 hours ahead of Castle Rock.
already the next day
Time zones
| Castle Rock | America/Denver · UTC-06:00 |
|---|---|
| London | Europe/London · UTC+01:00 |
Castle Rock is currently on daylight saving time (UTC-06:00). Next change: 2026-11-01 01:00.
London is currently on daylight saving time (UTC+01:00). Next change: 2026-10-25 01:00.
Hour-by-hour conversion
Calculated for 2026-09-20 local time in Castle Rock. The two places start and end daylight saving on different dates, so another day can give a different result.
| Castle Rock (source) | London (target) |
|---|---|
| 00:00 | 07:00 |
| 01:00 | 08:00 |
| 02:00 | 09:00 |
| 03:00 | 10:00 |
| 04:00 | 11:00 |
| 05:00 | 12:00 |
| 06:00 | 13:00 |
| 07:00 | 14:00 |
| 08:00 | 15:00 |
| 09:00 | 16:00 |
| 10:00 | 17:00 |
| 11:00 | 18:00 |
| 12:00 | 19:00 |
| 13:00 | 20:00 |
| 14:00 | 21:00 |
| 15:00 | 22:00 |
| 16:00 | 23:00 |
| 17:00 | 00:00 next day |
| 18:00 | 01:00 next day |
| 19:00 | 02:00 next day |
| 20:00 | 03:00 next day |
| 21:00 | 04:00 next day |
| 22:00 | 05:00 next day |
| 23:00 | 06:00 next day |
Other common differences from Castle Rock
FAQ
- How many hours apart are Castle Rock and London right now?
- The answer at the top of the page is calculated for the current moment and states which side is ahead. The gap changes during the year, because the two places usually start and end daylight saving on different dates.
- Is this difference the same all year?
- Not necessarily. Castle Rock uses America/Denver and London uses Europe/London; if either observes daylight saving, the gap shifts during the year. Use “Convert a specific date and time” below to calculate it for a given day.
- How do I read the conversion table?
- The left column lists each whole hour in Castle Rock; the right column is the local time in London at that same instant, with date rollovers marked. On the day clocks jump forward, some hours do not exist locally — the table says so instead of showing a plausible but wrong value.