Overview
Compare time between two cities before a call, meeting or trip. The tool shows each local time, the difference, and each city's offset from UTC.
Formula
The reference moment is converted to each time zone using the IANA database, then the difference between their UTC offsets is calculated.
How it works
Choose both cities
From a list of more than 50 cities.
Set the moment
Leave empty for now or pick another moment.
Read the difference
Local times and the hour gap appear.
Worked examples
Riyadh and London
Riyadh is usually three hours ahead of London, dropping to two during British summer time.
Dubai and New York
A large gap that changes between summer and winter because of daylight saving.
Frequently asked questions
Is daylight saving included?
Yes. Offsets are computed for the selected date, so they change automatically at DST boundaries.
What does 'ahead' mean?
The first city's clock is later than the second. If Riyadh is 15:00, London is 12:00.
Why does the result change by date?
Some countries observe daylight saving for part of the year, changing their UTC offset.
This calculator is for educational and informational purposes only and is not a substitute for professional advice.