How it works
The converter uses the time-zone database built into your browser (the same one your phone and computer clock use), so it knows every country’s rules for summer time. Choose the place where the time is known, then the place you want to convert it to.
UK time changes, other countries do not
The UK is on GMT (UTC+0) in winter and British Summer Time (UTC+1) from the last Sunday of March to the last Sunday of October. The UAE (UTC+4), Saudi Arabia (UTC+3) and Pakistan (UTC+5) do not change their clocks. So the gap between London and Dubai is 4 hours in winter but 3 hours in summer – a common cause of missed calls.
Worked example: a call at 9:00 in London.
- In January (GMT): 13:00 in Dubai, 14:00 in Karachi, 12:00 in Makkah.
- In July (BST): 12:00 in Dubai, 13:00 in Karachi, 11:00 in Makkah.
Times that do not exist (or exist twice)
When clocks go forward, an hour is skipped (in the UK, 01:00–01:59 on the last Sunday of March does not exist); when they go back, an hour happens twice. If you pick a skipped time, the converter moves it forward to the next real time.
Tips for planning across time zones
- When sending an invite, say the time in both places (“10:00 London / 14:00 Dubai”).
- Check the date as well as the hour – late evening in the UK is already tomorrow in Pakistan.
Prayer and Ramadan times
Prayer times depend on the position of the sun in each city, not only on the time zone, so two cities in the same time zone can have different times. Use a local prayer timetable or mosque for those; this converter is for meetings, calls, flights and deadlines.
Flights
Airline tickets always show departure and arrival times in the local time of each airport. To work out how long a flight really takes, convert both times into the same zone first.