Time Zone Converter — Free Online Tool
Convert times between world time zones instantly, DST-aware. · No signup · Works on mobile
100% private: your data is processed in your browser. Nothing is uploaded to our servers.
How to use the time zone converter
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Choose the source time zone and enter the date and time.
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Choose one or more target time zones (e.g. IST, EST, GMT).
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See converted times instantly, with day changes clearly marked (+1 day / −1 day).
What does this tool do?
This free time zone converter translates any date and time between world time zones instantly — with daylight saving time handled automatically. Pick a source zone, a target zone, and a time to see the exact converted result, perfect for scheduling international meetings and calls.
How does the time zone converter work?
The converter uses your browser's built-in IANA timezone database (the same one operating systems use), so conversions respect every region's current DST rules. New York↔London, for example, is usually a 5-hour gap but briefly 4 hours in late March when the US changes clocks first.
Frequently Asked Questions
What is the time difference between IST and EST?
India Standard Time is UTC+5:30 year-round. US Eastern Time is UTC−5 in winter (EST) and UTC−4 in summer (EDT). So the gap is 10.5 hours in winter and 9.5 hours in summer — 9 PM IST is 10:30 AM EST in January but 11:30 AM EDT in July.
Why did my converted time change by an hour recently?
Daylight saving time. About 70 countries shift clocks twice a year on different dates — the US changes in mid-March and early November, Europe in late March and late October. This converter applies the correct offset for the specific date you enter, not just today's offset.
Is the time zone converter really free?
Yes — 100% free with no hidden charges, trial limits, or premium tiers for core features. You don't need to create an account or enter an email address. The site is supported by non-intrusive display ads, which keeps every tool free for everyone.
Is my data private when using the time zone converter?
Completely. The time zone converter runs entirely in your browser using JavaScript — nothing you type or upload is sent to our servers. When you close the tab, your data is gone. This makes it safe for confidential documents, financial figures, and personal information.
Does the time zone converter work on mobile phones?
Yes. The time zone converter is built mobile-first and works on any phone or tablet with a modern browser — iPhone (Safari), Android (Chrome), and everything in between. The layout adapts to small screens, so buttons and inputs stay easy to tap on a 375px-wide display.
Do I need to install anything to use the time zone converter?
No. The time zone converter works directly in your web browser — no downloads, no extensions, no signup. Just open the page, use the tool, and get your result instantly. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.