Time Zone Converter

Convert time between 30+ time zones. Pick a date and time, select the source and target zones, and get instant results.

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World Clocks

Understanding Time Zones

The world is divided into 24 primary time zones, each roughly 15° of longitude wide. UTC (Coordinated Universal Time) is the global time standard from which all zones are offset. Some zones use half-hour or 45-minute offsets (e.g., India at UTC+5:30, Nepal at UTC+5:45).

Common Time Zone Offsets

Abbreviation	Name	UTC Offset
UTC / GMT	Coordinated Universal Time	+0:00
IST	India Standard Time	+5:30
EST	Eastern Standard Time	-5:00
CST	Central Standard Time	-6:00
PST	Pacific Standard Time	-8:00
CET	Central European Time	+1:00
JST	Japan Standard Time	+9:00
AEST	Australian Eastern Standard Time	+10:00
SGT	Singapore Time	+8:00

Daylight Saving Time (DST)

Many countries adjust clocks by 1 hour during summer months. This converter uses the IANA time zone database built into your browser, which automatically accounts for DST transitions. Always specify the city/region rather than just an abbreviation for accurate DST handling.

Frequently Asked Questions

UTC (Coordinated Universal Time) and GMT (Greenwich Mean Time) share the same time in practice, but UTC is the modern standard based on atomic clocks, while GMT is the historical time zone based on solar time at Greenwich, England. UTC is used in technical contexts; GMT is colloquial.

India chose a single time zone at UTC+5:30 to cover its large east-west span. The 30-minute offset was selected as a compromise between Kolkata (east) and Mumbai (west) times, representing approximately the geographic centre of the country.

Yes. It uses the IANA time zone database built into your browser's JavaScript engine, which includes historical and current DST rules. If you select a zone like "America/New_York," DST is automatically applied for the selected date.

Time zones, UTC, and DST in plain language

Every place on earth keeps an offset from Coordinated Universal Time (UTC). Most offsets are whole hours (UTC−5 New York standard), some are half-hours (UTC+5:30 India, UTC+9:30 parts of Australia), and a few are quarter-hours (UTC+5:45 Nepal, UTC+12:45 Chatham Islands). Daylight Saving Time (DST) shifts the offset by an hour seasonally in most of North America, Europe, and Australasia. India, China, Japan, and most of Africa and South America do not observe DST.

How DST changes shift conversions

From late March to late October, New York observes Eastern Daylight Time (UTC−4), but in winter it is on Eastern Standard Time (UTC−5). The gap to London changes too, because the UK shifts on different dates than the US. For the second weekend of March and the last weekend of October, the gap between New York and London is briefly four hours instead of the usual five.

Practical advice for scheduling

For one-off meetings, send invitations in your calendar tool with the intended local time and let the recipient's calendar do the conversion automatically.
For recurring meetings spanning DST shifts, choose a time that works in the months where the gap is widest — usually November through March for transatlantic meetings.
For asynchronous work across time zones, agree on a "follow-the-sun" handoff window rather than trying to make everyone available at the same hour.

Common time-zone gotchas

"GMT" and "UTC" are not exactly the same. UTC is a precise atomic standard; GMT is a time zone that historically referred to the mean solar time at the Royal Observatory in Greenwich. In everyday use they are treated as identical, but in scientific or precise timekeeping contexts the difference matters.