Time Zone Converter
Convert any time between time zones — IST to EST, GMT to PST and hundreds more — with automatic daylight-saving handling.
About the Time Zone Converter
This time zone converter translates any date and time from one zone to another in a click. Pick a date and time (it defaults to right now), choose the source and destination from a curated list of about 40 major world zones — including IST (India), ET (New York), GMT/BST (London), CET (Central Europe), GST (Dubai), SGT (Singapore), JST (Tokyo) and AET (Sydney) — and see both times plus the exact hour difference. A swap button reverses the direction instantly.
Daylight saving time is handled automatically. The converter uses the IANA time zone database built into your browser, so it knows that New York is UTC-5 in winter but UTC-4 in summer, that London switches between GMT and BST, and that India stays at UTC+5:30 year-round. Half-hour and 45-minute offsets like India and Nepal are calculated precisely.
It is built for scheduling international meetings, planning calls with overseas family, coordinating remote teams across the US, Europe and Asia, and working out webinar or flight times. Everything runs locally in your browser using your device's own time zone data.
How to Use the Time Zone Converter
- 1Pick the date and time to convert — it defaults to now.
- 2Choose the source time zone (e.g. IST — India).
- 3Choose the destination time zone (e.g. ET — New York).
- 4Read both times and the hour difference; click Swap to reverse.
Frequently Asked Questions
How do I convert IST to EST?
Select Asia/Kolkata (IST) as the source and America/New_York as the destination, then enter your time. India is UTC+5:30 year-round, while New York is UTC-5 in winter (EST) and UTC-4 in summer (EDT) — so the gap is 10.5 hours in winter and 9.5 in summer. 9:00 PM IST is 10:30 AM EST or 11:30 AM EDT.
What is the time difference between India and London?
India (IST, UTC+5:30) is 5.5 hours ahead of London in winter, when the UK is on GMT, and 4.5 hours ahead in summer during British Summer Time (late March to late October). So 2:00 PM in Mumbai is 8:30 AM in London in winter and 9:30 AM in summer — the converter applies the right offset for your chosen date.
Does this converter handle daylight saving time automatically?
Yes. It uses IANA time zone identifiers like America/New_York rather than fixed offsets, and your browser's built-in time zone database applies the correct rules for the specific date you enter. Convert a January date and a July date between London and New York and you will see the difference change from 5 to 5 hours only when one side has switched.
Why do some countries have half-hour time zones?
A zone's offset is a national choice, and some countries pick offsets that better match their solar time. India uses UTC+5:30 because the country spans two natural zones and chose the midpoint; Iran uses UTC+3:30, and Nepal is UTC+5:45. This converter handles all fractional offsets exactly, showing differences like "+9.5 hours".
What is the best time for a meeting between the US, Europe and India?
The classic overlap window is roughly 8:00–10:00 AM New York time, which is 1:00–3:00 PM in London and 5:30–7:30 PM in India (winter timings). Convert your proposed slot to each attendee's zone with this tool, and remember US and European DST switch on different dates in March and October–November.