Quick answer: 12:00 noon in Riyadh is 9:00 am in London in winter (UTC+3 against UTC+0) and 10:00 am in summer, when the UK moves its clocks forward an hour.
How it's calculated
Every time zone is a fixed offset from Coordinated Universal Time (UTC) on a given date. The time you enter is first converted to UTC by subtracting its zone's offset, then the other zone's offset is added. Saudi Arabia, Kuwait, Qatar, Bahrain and Iraq are UTC+3; the UAE and Oman UTC+4; Pakistan UTC+5; India UTC+5:30.
Offsets can change with the date. The Gulf countries do not use daylight saving time, but the UK, Europe, North America and others move their clocks forward in summer, so the difference from Riyadh or Dubai shrinks by an hour then. The calculator uses the time zone rules built into your browser (the IANA database) for the date you choose.
If the converted time crosses midnight, the date changes too: the result shows the next or previous day. To count days between dates instead, use days between two dates.
Worked examples
- 12:00 Riyadh, 6 November 2026 → London: 12:00 − 3 h = 09:00 UTC = 09:00 London
- 09:00 Dubai → Manila: 09:00 − 4 h = 05:00 UTC; + 8 h = 13:00
- 20:00 Doha → New York (winter): 20:00 − 3 h = 17:00 UTC; − 5 h = 12:00
Frequently asked questions
What is the time difference between Saudi Arabia and the UAE?
One hour. The UAE (UTC+4) is one hour ahead of Saudi Arabia (UTC+3) all year, as neither uses daylight saving time.
What is the time difference between Riyadh and India or Pakistan?
India is 2 hours 30 minutes ahead of Riyadh (UTC+5:30), and Pakistan 2 hours ahead (UTC+5).
Why does the difference with London or New York change during the year?
Those countries use daylight saving time in summer, moving their clocks one hour forward. The Gulf keeps the same time all year, so the gap is one hour smaller in their summer.
Do Gulf countries change their clocks?
No. Saudi Arabia, the UAE, Qatar, Kuwait, Bahrain and Oman stay on the same time all year.
Which Gulf countries share a time zone?
Saudi Arabia, Qatar, Kuwait and Bahrain are on UTC+3. The UAE and Oman are on UTC+4, one hour ahead.
What is the difference between UTC and GMT?
For everyday use they are the same time. UTC is the modern scientific standard, while GMT is the older name and is also used as a time zone in the UK in winter.