Timezone Converter

The Timezone Converter is a free online tool that convert times between 55+ timezones with multi-zone view, world clock, dst detection, and meeting planner with business hours overlap.. It runs entirely in your browser with no installation or sign-up needed.

Auto-detects DST by comparing UTC offsets in January and July. DST status shown as a badge on every timezone.

See the same time in up to 12 zones simultaneously. Add/remove zones, uses your converter input or current time as reference.

24-hour grid with green (business hours 9-5), yellow (adjacent), red (outside). Highlights hours where all selected zones overlap.

Yes, the Timezone Converter is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The Timezone Converter processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Timezone Converter is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Timezone Converter in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Timezone Converter works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

A UTC offset is just a number, like +5:30 or -8, describing how far a clock sits ahead of or behind Coordinated Universal Time at one specific moment. An IANA time zone, such as America/New_York or Asia/Kolkata, is the full set of rules for a region: its standard offset, its daylight saving start and end dates, and every historical change. The key difference is that an offset can change through the year while the IANA zone stays the same, because the zone is what decides when the offset shifts. This tool works with IANA zones, so it applies the correct offset for the exact date you enter rather than assuming a fixed gap. Pick your source and target cities and it shows both the live offset and the difference for you.

The gap between two cities changes because countries start and end daylight saving time on different dates, and some never observe it at all. For example, the difference between London and New York is usually five hours, but for a few weeks each spring and autumn it briefly becomes four or six hours, because the UK and the US spring forward and fall back on different weekends. Cities that skip DST entirely, like those in most of Asia or Arizona, drift relative to ones that do. That is why a fixed mental shortcut often fails near the changeover dates. This converter reads the actual rules for the date you choose, so the difference it shows reflects whatever DST state each side is in. Enter your date and it recalculates the gap automatically.

The reliable way is to lay every participant's local clock side by side and look for hours that fall inside everyone's working day at the same moment. Doing this in your head gets hard past two zones, especially when one city is already on tomorrow's date. The Meeting Planner tab handles it for you: add each zone, pick a date, and it draws all 24 hours with every city's local time color-coded. Green marks core business hours of 9 AM to 5 PM, yellow marks the slightly early or late edges, and red marks hours outside the working day. A summary banner then lists every hour where all selected zones are simultaneously in business hours, or tells you plainly when no shared window exists. Open the Meeting Planner, add your cities, and scan for the green column.

Yes. Because the offsets come from your browser's built-in time zone database rather than a hard-coded table, the converter applies the daylight saving rules that were or will be in effect for the specific date you enter, not just today's. It detects DST by comparing each zone's UTC offset in January against July: if they differ and your chosen date falls on the summer side of the calendar, that zone gets a DST badge. Zones that never shift, such as India, Arizona, and Brisbane, are correctly left unmarked. This means converting a meeting set for next March or checking a timestamp from last summer both stay accurate, instead of assuming a constant gap. Type any date and time and read the DST badge to confirm which side is in summer time.

Yes, the Multi-Zone View tab shows one reference moment across up to 12 cities side by side, which is far quicker than running separate conversions one pair at a time. You can add or remove zones freely to match the people or offices you care about. If you have already typed a date and time in the Converter tab, that moment carries over so every city reflects it; otherwise the view tracks the live current time and updates on its own. There is also a World Clock tab with a live grid of ten major cities, including New York, London, Tokyo, Mumbai, and Lagos, each showing a sun or moon icon for day or night. To compare a specific instant everywhere, enter it in the Converter, then switch to Multi-Zone View and add your cities.