Time Zone Converter
Convert time between any two time zones — plus live world clock for 30+ cities
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Current World Times
About This Time Zone Converter
This free time zone converter uses your browser's built-in Intl.DateTimeFormat API to convert times accurately, including daylight saving time (DST) transitions. Select any two time zones from the dropdowns, enter a date and time, and see the exact equivalent time instantly.
The world clock section below shows live current times in 30 major cities, updating every second. All calculations happen entirely in your browser — no data is sent to any server.
Frequently Asked Questions
UTC (Coordinated Universal Time) is the global time standard. All time zones are defined as offsets from UTC — New York is UTC-5 in winter, UTC-4 in summer. UTC itself never changes for daylight saving.
GMT is based on Earth's rotation; UTC uses atomic clocks. They're essentially the same for everyday use — within 1 second of each other. Most people and systems treat them as interchangeable.
DST advances clocks by 1 hour in summer to extend evening daylight. Not all countries use it — India, Japan, China, and most of Africa don't change their clocks, which simplifies international scheduling.
There are 24 standard zones but 38+ in practice, because some countries use fractional offsets: India is UTC+5:30, Nepal UTC+5:45, Australia's centre is UTC+9:30.
Yes. The browser's Intl API uses the IANA timezone database, which includes all historical and future DST rules for every country. The conversion is always correct for the specific date you enter.