Time Zone Converter
Convert any date and time between world time zones instantly. Pick a source and target zone and the converter handles UTC offsets and daylight saving for you.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
How it works
How the Time Zone Converter Works
This tool converts a date and time from one time zone to another. Choose the date and time, the zone it is in, and the zone you want it in. The converter reads your entry as wall-clock time in the source zone, works out the matching universal instant, and re-displays it in the target zone — automatically applying each region’s daylight-saving rules.
The full converted date is shown alongside the time, so conversions that cross midnight or the international date line clearly land on the right day.
The Formula
Every zone is an offset from UTC (Coordinated Universal Time). To convert:
UTC instant = source wall-clock time − source UTC offset target time = UTC instant + target UTC offset
Because the offsets depend on the date (daylight saving), the converter looks up each offset for the specific day you enter rather than assuming a fixed gap.
Worked Example
Convert 3:00 PM New York time on 14 June to London time:
- In June, New York is on EDT (UTC−4) and London on BST (UTC+1).
- 3:00 PM EDT − (−4 h) = 7:00 PM UTC
- 7:00 PM UTC + 1 h = 8:00 PM London time
So 3:00 PM in New York is 8:00 PM in London on that date.
Common UTC Offsets
| City / zone | Standard offset | Daylight offset |
|---|---|---|
| Los Angeles | UTC−8 | UTC−7 |
| New York | UTC−5 | UTC−4 |
| London | UTC+0 | UTC+1 |
| Dubai | UTC+4 | (no DST) |
| Kolkata | UTC+5:30 | (no DST) |
| Tokyo | UTC+9 | (no DST) |
| Sydney | UTC+10 | UTC+11 |
Why Time Zone Conversion Matters
Getting a time zone wrong by even an hour can mean a missed meeting, a flight booked for the wrong day, or a livestream you tune into too late. Scheduling international calls, coordinating remote teams, and planning travel all depend on accurate conversions that respect daylight-saving changes — exactly what this converter does for you.
Frequently asked questions
How does the time zone converter work?+
Enter a date and time and the zone it belongs to. The tool converts that wall-clock time to the matching UTC instant using the source zone's offset, then displays the same instant in your target zone. Daylight saving is applied automatically.
Does this account for daylight saving time?+
Yes. The converter uses your browser's built-in IANA time-zone database, which knows each region's daylight-saving rules and historical changes, so the offsets are correct for the specific date you enter.
What is UTC and why is it shown?+
UTC (Coordinated Universal Time) is the global reference time with no daylight saving. Every zone is defined as an offset from UTC, so showing the UTC equivalent makes it easy to see the true instant being converted.
Why is the time difference between two cities not fixed?+
Because daylight saving starts and ends on different dates in different countries, the gap between two cities can shift by an hour for a few weeks each year. That is why the converter recalculates the offset for the exact date you choose.
Can I convert times across the international date line?+
Yes. When converting between far-apart zones such as Auckland and Honolulu, the result may land on the previous or next calendar day. The converter shows the full date as well as the time so the day change is clear.