Timezone Converter Online Free

How to convert between time zones

Pick a source zone and a target zone, set a time, and read the converted result. Your browser's own time zone database does the work, so daylight saving transitions are applied correctly.

Why this is harder than adding hours

Time zones are political, not geographical. They change when governments decide they should, sometimes at short notice, and the rules are messy. India runs at UTC+5:30, Nepal at UTC+5:45, and the Chatham Islands at UTC+12:45, offsets that are not whole hours at all. Several countries have shifted zones outright in recent years.

Daylight saving makes it worse. Roughly a third of the world observes it, the switch dates differ between countries, and the southern hemisphere moves in the opposite direction to the northern. For a few weeks each spring and autumn, the gap between London and New York is not the five hours people memorise. Converting by mental arithmetic is exactly when meetings get missed.

Practical habits for scheduling

• Write invitations with the zone named explicitly, such as "14:00 IST" rather than "14:00".
• Let calendar software handle recurring meetings; it will follow each participant's rules through the changeover.
• For anything spanning a DST boundary, confirm the week before it happens.
• UTC is the neutral reference when coordinating across many countries at once.

Frequently asked questions

Are daylight saving rules kept current?

They come from the IANA time zone database that ships with your browser, which is updated as governments announce changes. Keeping your browser current keeps the rules current.

What is the difference between IST and GMT?

India Standard Time is UTC+5:30 year round, with no daylight saving. GMT is UTC+0, though the UK moves to UTC+1 in summer.

Is anything sent to a server?

No. The conversion is performed locally in your browser.