Which countries stay on the same clock as the UK all year?
Two countries match the United Kingdom through every clock change: Portugal and Ireland. Both switch on the same dates (last Sunday of March and last Sunday of October) and at the same local moment. When London is on GMT (UTC+0), Lisbon and Dublin are on UTC+0. When London moves to BST (UTC+1), Lisbon shifts to Western European Summer Time and Dublin shifts to Irish Standard Time. The clock time is identical.
The Crown Dependencies (Isle of Man, Jersey, Guernsey) also follow this pattern exactly. They are not part of the UK but adopt GMT in winter and BST in summer on the same change dates.
Why does Iceland share UK time only in winter?
Iceland runs on GMT (UTC+0) all year. No daylight saving. That means Reykjavik matches London from late October to late March, then falls an hour behind once the UK switches to BST in spring. In July, when London is on BST (UTC+1), Reykjavik is on UTC+0. A 15:00 call in London is 14:00 in Reykjavik. In January, the two cities share the same clock time.
When does Morocco match UK time?
Morocco has used UTC+1 year-round since 2018. That puts it one hour ahead of the UK in winter. But during the holy month of Ramadan, Morocco temporarily reverts to UTC+0. This creates two windows where the kingdom aligns with the UK: the summer months when the UK is on BST (UTC+1), and the Ramadan period when Morocco drops back to UTC+0.
Ramadan shifts roughly 11 days earlier each year. If you schedule a call with Casablanca or Rabat in March or April, check whether the month of fasting is active. Outside Ramadan and outside British Summer Time, Morocco is one hour ahead.
Which Crown Dependencies and territories share UK time?
The Isle of Man, Jersey, and Guernsey follow UK time to the minute. GMT in winter, BST in summer, same change dates. British Overseas Territories do not. Each territory sets its own zone. Gibraltar runs on UTC+1 year-round. Bermuda sits at UTC-4. The Falkland Islands are on UTC-3. None of them match the UK.
Which countries share UK time at a glance
| Location | Winter offset (UTC) | Summer offset (UTC) | Matches UK? |
|---|---|---|---|
| United Kingdom | 0 (GMT) | +1 (BST) | , |
| Portugal | 0 (WET) | +1 (WEST) | All year |
| Ireland | 0 (GMT) | +1 (IST) | All year |
| Iceland | 0 (GMT) | 0 (GMT) | Winter only |
| Morocco | 0 (Ramadan) | +1 | Summer only (except Ramadan) |
| Isle of Man | 0 (GMT) | +1 (BST) | All year |
| Jersey | 0 (GMT) | +1 (BST) | All year |
| Guernsey | 0 (GMT) | +1 (BST) | All year |
When does assuming the same time zone go wrong?
Recurring meetings trip people up. If you lock a weekly call with Reykjavik based on a January schedule, the offset shifts by one hour when the UK enters BST in late March. The same call slot in July puts Iceland an hour behind.
Flights between London and Reykjavik illustrate the split. In January, a 10:00 departure from London lands at 10:00 Icelandic time. In July, that same 10:00 flight touches down at 09:00 local time. The clock hour is earlier, even though the flight duration is unchanged.
Morocco adds a second trap. A business that works with Moroccan partners in October (BST still active, Morocco on UTC+1) finds the two countries aligned. By November, the UK has fallen back to GMT and Morocco remains on UTC+1: suddenly Casablanca is an hour ahead. Then Ramadan arrives and Morocco drops back to UTC+0, matching the UK again. Check a time zone converter before confirming any meeting that spans a clock change or a religious observance period.