Time zone converter
Convert a time between two zones, with the difference and daylight saving applied.
Europe/Madrid
Sep 14, 2026, 2:11 AM
UTC+02:00
America/New_York
Sep 13, 2026, 8:11 PM
UTC-04:00
Difference: -6 hours
Conversion uses the browser's IANA time zone database (Intl), so it respects each region's daylight saving changes. If a local time does not exist due to the spring-forward gap, it is adjusted to the nearest valid time.
Built by
Miguel Ángel Colorado Marin (MACM)
Built by
Miguel Ángel Colorado Marin (MACM)
Full-Stack Developer · Guadalajara, España
I develop web apps, digital tools and full projects — from design to deployment.
Coordinating a call between Madrid and New York when one of them changes its clocks first is where one-hour mistakes happen. This converter uses the IANA time zone database that ships with the browser, so it automatically applies each region's daylight saving and shows the real offset from UTC at that exact instant. Besides the converted time, it reports the difference in hours between both zones, which in summer may not be the same as in winter.
Features
- ✓Conversion between any pair of IANA time zones
- ✓Browser time zone database (Intl), with each region's daylight saving
- ✓Shows the UTC offset and the difference in hours between the two zones
- ✓Support for half-hour zones such as India (+05:30)
- ✓All calculation is local, no servers
How do I convert the time between time zones?
- 1
Choose the zones
Type or select the source and target zones from the list.
- 2
Enter the date and time
Set the time in the source zone, or press Now to use the current one.
- 3
Read the result
You get the equivalent time in the target zone and each one's offset.
- 4
Check the difference
The hour difference is computed for that specific date, with DST.
Frequently asked questions
Does it account for daylight saving?
Yes. Conversion uses the browser's IANA database, which includes the DST rules. If one region is on daylight saving and the other is not, the difference reflects that state on the chosen date.
Does it work with half-hour zones?
Yes. Zones such as India (UTC+05:30), Nepal (UTC+05:45) or some Australian territories are handled correctly, since the real offset in minutes is used.
What if the local time does not exist due to DST?
In the spring-forward there is an hour that does not exist (for example, from 02:00 to 03:00 in Madrid). In that case the calculation resolves to the nearest valid time instead of failing.
Does it use an external server?
No. Both the zone list and the offsets come from the browser itself. There are no network calls and none of the times you enter leave your device.
Related tools
Embed Time Zone Converter on your site
Add Time Zone Converter to any web page with a simple iframe. Free, with attribution to miguelacm.es.
<iframe
src="https://miguelacm.es/embed/timezone-converter"
width="100%"
height="700"
frameborder="0"
title="Time Zone Converter — miguelacm.es"
></iframe>