Time Zone Converter

Time Zone Converter

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Free Online Time Zone Converter

Need to schedule a meeting across continents or figure out when a live event starts in your city? Our free time zone converter lets you translate any date and time from one world time zone to another in seconds. Just pick the date, select your source and target time zones, and get the exact local time — no mental math required.

Understanding Time Zones

The world is divided into 24 primary time zones, each roughly 15 degrees of longitude wide, corresponding to one hour of solar time. The standard reference is UTC (Coordinated Universal Time), formerly known as Greenwich Mean Time (GMT). All other time zones are expressed as offsets from UTC — for example, India Standard Time (IST) is UTC+5:30, while US Eastern Standard Time (EST) is UTC−5.

What Is DST (Daylight Saving Time)?

Many countries observe Daylight Saving Time (DST), advancing clocks by one hour in spring and reverting in autumn to make better use of evening daylight. This means a timezone like America/New_York shifts between EST (UTC−5) and EDT (UTC−4) depending on the time of year. Our converter uses the IANA timezone database via the browser's built-in Intl.DateTimeFormat API, which automatically accounts for DST transitions.

Common Business Use Cases

  • International meetings: Find the overlapping business hours between New York, London, and Singapore.
  • Remote work: Know when your teammates in different continents are online.
  • Live events and webinars: Convert event start times for global audiences.
  • Flight planning: Understand arrival times when crossing multiple time zones.
  • Financial markets: Track opening and closing times for NYSE, LSE, or Tokyo Stock Exchange.

Frequently Asked Questions

What is UTC and why is it important?
UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. It has no daylight saving offset, making it the stable reference point for all other time zones.
Does this tool account for Daylight Saving Time?
Yes. The converter uses your browser's Intl API with the IANA timezone database, which automatically applies DST rules for the selected date.
What is the difference between GMT and UTC?
GMT (Greenwich Mean Time) is a time zone, while UTC is a time standard. For practical purposes they represent the same offset (UTC±0), but UTC is the modern, precise standard used in computing.
Why does India have a half-hour offset (UTC+5:30)?
India chose UTC+5:30 as a single national time zone to avoid splitting the country across two zones, acknowledging that the geographic center falls between UTC+5 and UTC+6.
How many time zones does the USA have?
The contiguous USA spans four main time zones: Eastern, Central, Mountain, and Pacific. Including Alaska and Hawaii, there are six, and US territories add a few more.