Updated: July 2026
Time Zone Converter is a free online tool that shows the current time in reference cities on several continents and converts a specific time between different zones, without you having to do the math in your head.
What is it
Arranging a meeting with someone on the other side of the world, calling a family member who has moved countries or simply knowing what time it is in another zone before sending a message are common situations that require calculating the time difference. The problem is that this difference is not always a round number of hours, and even changes throughout the year because of daylight saving time in some countries.
This tool tracks, in real time, the time of cities such as São Paulo, New York, London, Lisbon, Los Angeles, Tokyo, Sydney and Dubai. You choose which of these cities is your reference zone, and all others automatically show the time difference in relation to it, as well as a visual indicator of day or night in each location.
How to use
- Choose your base zone in the "Your Base Zone" field, selecting the city closest to your current time.
- See the live time of each city on the cards, updated every second, with the time difference marked in relation to your time zone.
- Use the meeting planner: enter a date and time in your home zone and the tool automatically shows what time it will be in other cities at that same moment.
- Check the day and night indicator: light cards with the sun icon indicate that it is day in that city, and dark cards with the moon icon indicate that it is night.
Is daylight saving time considered?
Yes. The calculations use the browser's own time zone data, which already includes the summer time rules of the countries that adopt it. This means that even on dates close to the time change, the difference shown tends to be correct. The tool works entirely in the browser, without sending anything to servers, it is free and does not require registration to be used as many times as you need.