Time Zone Converter

The Time Zone Converter translates any date and time from one time zone to as many others as you like, side by side. It uses the time zone database built into your browser (the same IANA data your operating system uses), so daylight saving rules are always applied correctly — and like every tool on this site, it works entirely offline with no data sent anywhere.

Why time zone conversion is trickier than it looks

"New York is 7 hours behind Istanbul" is only true part of the year. Daylight saving time starts and ends on different dates in different countries — and some regions skip it entirely — so the offset between two cities can change twice a year, sometimes twice in a single month. Add day boundaries (a 22:00 call in Los Angeles is tomorrow in Tokyo) and manual conversion becomes genuinely error-prone. This tool resolves all of it from the official IANA time zone database.

Key Features

• Full IANA Zone List: Every time zone your browser knows (typically 400+), searchable by region and city.
• Multiple Targets at Once: Compare one source time across any number of cities simultaneously — ideal for scheduling meetings across offices.
• DST-Correct: Offsets are computed for the specific instant you enter, so daylight saving transitions are always handled correctly.
• Live UTC Offsets: Each row shows the zone's exact current offset (e.g. UTC+03:00) for the chosen moment.
• Day-Change Badges: A clear (+1 day) / (-1 day) marker warns you when the converted time falls on a different calendar day.
• Auto-Detected Local Zone: Your own time zone is preselected as the source; the "Now" button loads the current time.
• 100% Client-Side Privacy: All conversion happens with the browser's built-in Intl API — no network requests.

How to Use the Time Zone Converter

1. Pick a date and time (or click Now for the current moment).
2. Choose the source time zone — your local zone is detected automatically.
3. Add target zones from the dropdown; remove any with the ✕ button.
4. Read the converted time, date, UTC offset, and day-change badge for each city.
5. Click Copy on a row to copy the full converted time.

Why Choose This Tool?

Web-based world clocks usually show only the current time. This converter answers the harder question — "what time will 14:00 next Tuesday in Berlin be in São Paulo?" — with the DST rules of that future date applied. It requires no account, tracks nothing, and works offline.

Frequently Asked Questions (FAQ)

How accurate are the conversions?

They come from the IANA time zone database embedded in your browser — the same authoritative source used by operating systems and servers worldwide, including historical and future daylight saving rules.

Why did the offset between two cities change from last month?

Daylight saving time. Countries switch on different dates (and some not at all), so the gap between two cities can vary through the year. The tool always computes the offset for the exact moment you entered.

What does the (+1 day) badge mean?

The converted time falls on the next calendar day in the target zone. For example, 20:00 Monday in Los Angeles is 12:00 Tuesday in Tokyo.

Can I use this for scheduling meetings?

Yes — that's the main use case. Enter the proposed meeting time in your zone, add every participant's city, and check that the result is reasonable everywhere before sending the invite.