Tools
Free time zone tools that do the maths for you
Everything here runs in your browser, uses the official IANA time zone rules — including daylight saving changes on the exact date you pick — and never sends your data anywhere. Pair these with the live world clock and our time zone guides.
Time Zone Converter
Pick a date and time in any city and instantly see what moment that is in every other city you care about — with daylight saving handled for the exact date you chose.
Open toolMeeting Planner
Add up to four cities and see all 24 hours side by side, colour-coded by business hours, evenings and night, so you can spot the overlap that works for everyone.
Open tool