Time Zone Converter Online Free
Convert any date and time between 45+ world time zones instantly — with UTC offsets, DST awareness, and a live world clock. No signup, runs entirely in your browser.
Enter a date and time to see the converted result.
World Clock
How the Time Zone Converter Works
- 1Enter the date and time you want to convert, or click "Use current time" to pre-fill with the current moment.
- 2Select the source time zone — the zone the entered time is in. The converter auto-detects your local zone on first load.
- 3Select the target time zone you want to convert to. Hit the swap button to reverse the direction instantly.
- 4Read the converted date and time in the result box, along with both zones' current UTC offsets. Copy the result in one click.
About Time Zones and UTC Offsets
Every time zone is defined as an offset from UTC — the world's primary time standard. Most offsets are whole hours, but some jurisdictions use half-hour (UTC+5:30 for India, UTC+9:30 for South Australia) or quarter-hour (UTC+5:45 for Nepal) increments. Daylight Saving Time shifts a zone's offset forward by one hour during summer months, which is why New York is UTC-5 in winter but UTC-4 from March to November.
The converter uses your browser's built-in IANA time zone database via the Intl.DateTimeFormat API. This means DST transitions, historical rule changes, and non-standard offsets are all handled correctly without any external library.
Tips for Scheduling Across Time Zones
Anchor on UTC
When coordinating across many zones, share times as UTC first (e.g. 14:00 UTC), then let each participant convert to their local time. This eliminates ambiguity entirely.
Watch DST transition weeks
The US, EU, and Australia change clocks on different dates. During the two-week gap between transitions, the UTC offset difference between US and EU zones is temporarily one hour different from normal.
Half-hour and quarter-hour zones
India (UTC+5:30), Iran (UTC+3:30), Afghanistan (UTC+4:30), and Nepal (UTC+5:45) use non-integer offsets. Don't assume all zones differ by whole hours when computing manually.
Use the world clock for quick checks
The world clock at the bottom updates every minute. Glance at it before a call to confirm the current local time for your counterpart without entering a specific date/time.
Include the date, not just the time
A meeting at 23:00 New York time is the following calendar day in Europe and Asia. Always specify the full date when sharing converted times to avoid confusion over day boundaries.
International Date Line
Crossing from UTC+12 (Fiji, New Zealand) to UTC-12 (Baker Island) skips or repeats a calendar day. Auckland and Los Angeles are always on different dates, even when they are only 3 hours apart in raw clock time.
Frequently Asked Questions
How does the time zone converter work?
The converter takes your chosen date, time, and source time zone, calculates the equivalent UTC moment using the official IANA time zone database built into your browser, then formats that UTC moment in the destination time zone. All computation happens locally — your data never leaves your device.
Does it account for Daylight Saving Time (DST)?
Yes. The converter uses the Intl.DateTimeFormat API, which references the full IANA tz database including all current and historical DST rules. If the date you enter falls during summer time in the selected zone, the correct DST offset is applied automatically.
What is UTC and why is it used as a reference?
UTC (Coordinated Universal Time) is the global time standard that all other time zones are measured relative to. For example, New York is UTC-5 in winter and UTC-4 in summer. Using UTC as a common reference makes arithmetic between any two zones straightforward: convert both to UTC, compare, then convert back.
What does the UTC offset (e.g. UTC+5:30) mean?
The UTC offset tells you how many hours and minutes a time zone is ahead of or behind UTC. UTC+5:30 means the local time is 5 hours 30 minutes ahead of UTC — India Standard Time uses this fixed offset year-round. Negative offsets (like UTC-5) are behind UTC.
Is my date and time data sent to a server?
No. The converter runs entirely in your browser using JavaScript and the built-in Intl API. No data is transmitted, stored, or logged anywhere.
Why is India's offset UTC+5:30 rather than a whole hour?
India chose a half-hour offset when it unified its time zones in 1906, positioning itself roughly in the centre of the subcontinent's longitude range. Other half-hour (and quarter-hour) offsets exist for similar historical or geographical reasons — Nepal uses UTC+5:45, for example.
How do I convert a time for a meeting with international participants?
Enter the proposed meeting date and time, select the host's time zone as the "From" zone, then switch the "To" zone for each participant's location and read off the local time. The world clock at the bottom also shows current times across 12 major cities at a glance.
What is the difference between GMT and UTC?
GMT (Greenwich Mean Time) and UTC are effectively the same offset (0) for everyday purposes. Technically, UTC is an atomic-clock-based standard maintained by the BIPM, while GMT is a time zone defined by mean solar time at the Greenwich meridian. In practice, all modern systems use UTC, and GMT is the common name for the UTC+0 time zone.