Time Zone Converter
Convert time between any two time zones. See the same moment across 20+ world cities instantly.
How to Use the Time Zone Converter
- 1
Enter Date and Time
Select a date and time in the Date and Time fields. Click "Now" to auto-fill the current time.
- 2
Select Time Zones
Choose the source time zone (From) and the target time zone (To) from the dropdown menus.
- 3
View the Result
The converted date and time appears instantly below. The full time zone name is shown for clarity.
- 4
Compare All Zones
Scroll down to see the same moment displayed across 20+ major world cities simultaneously.
About Time Zone Conversion
Time zones were standardized in the late 19th century to coordinate railroads across large countries. Today there are 38 distinct UTC offsets worldwide. Most countries follow a single offset while large countries like the US, Russia, and Australia span multiple zones.
Daylight Saving Time (DST) complicates time zone math — clocks change at different dates in different countries. This converter uses the browser's built-in Intl.DateTimeFormat API with IANA time zone identifiers, which automatically accounts for DST rules for each region.
This tool is ideal for scheduling international video calls, calculating meeting times for remote teams, and translating event times for travel planning. The 20+ city comparison table shows the same moment across all major global time zones simultaneously.
All conversion happens in your browser with no data sent to a server. The IANA time zone database used by browsers is updated regularly to reflect government-mandated DST changes.
You may also find our World Clock, Meeting Time Planner, and Unix Timestamp Converter helpful.
How to Use
- 1. Pick the source time zone and enter a time.
- 2. Pick the time zone you want to convert to.
- 3. The converted time appears instantly, with other major cities listed for reference.
Frequently Asked Questions
Does this handle Daylight Saving Time? expand_more
Yes — the browser Intl API uses IANA time zone data which automatically applies current DST rules.
What is UTC? expand_more
UTC (Coordinated Universal Time) is the primary time standard. It never observes DST and is used as the global reference point.
Why does the date sometimes change? expand_more
When converting across large time differences (e.g. UTC to Tokyo), the local date may be different (tomorrow or yesterday).
Can I add custom time zones? expand_more
The tool includes the 20 most-used IANA zones. If you need a specific zone not listed, the IANA database has 600+ entries.
Is this tool accurate for scheduling? expand_more
Yes — it uses the same Intl API that modern operating systems use. For critical scheduling, always double-check DST transition weeks.
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Guide
How to convert a date and time between time zones
The Time Zone Converter takes a Date and a Time, treats them as local time in the From zone, and shows the same moment in the To zone. The Converted Time panel spells out the full weekday, date, 12-hour time with seconds and the long zone name, such as Eastern Daylight Time. Beneath it, a table titled Same Moment in All Time Zones shows the identical instant in all 20 zones the tool offers, each with a short date so you can see when a result slips into the next or previous day.
The 20 zones are fixed: UTC, New York, Chicago, Denver, Los Angeles, London, Paris, Berlin, Moscow, Dubai, Kolkata, Dhaka, Singapore, Tokyo, Sydney, Auckland, Sao Paulo, Mexico City, Cairo and Johannesburg. Conversion uses your browser's built-in time zone data, including daylight saving rules for the date you choose.
Step by step
- Pick a Date and a Time. They start with your device's current date and time, and the Now button refills them.
- Choose the zone that time belongs to in the From list. It starts as UTC, so change it if your time is in another zone.
- Choose the To zone. It starts as New York (ET). The swap button between the two lists exchanges them.
- Read the Converted Time panel for the full result, including the date and the zone name.
- Scan Same Moment in All Time Zones to compare other cities, and note the short date at the end of each row.
When this is useful
- Fixing a meeting time between teams in India, the UK and the US.
- Checking whether a live stream or match in another country starts at a sensible hour for you.
- Planning a call to relatives abroad that avoids the middle of the night.
- Converting a deadline stated in UTC or a foreign office's time into local time.
Worked example: An 8:30 pm IST call on three different dates
Set From to Kolkata (IST) and Time to 20:30. On Friday 16 October 2026 the tool shows 11:00 AM Eastern Daylight Time in New York and 04:00 PM British Summer Time in London. On Wednesday 28 October, after the UK has gone back to Greenwich Mean Time but before New York has, it shows 11:00 AM in New York and 03:00 PM in London. On Tuesday 3 November, New York shows 10:00 AM Eastern Standard Time. India has no daylight saving, so the 20:30 stays the same while the others move.
Tips for better results
- Set From to your own zone before using Now, since Now fills your device's clock but leaves the From list unchanged.
- Read the long zone name in the result. 'Daylight' in it means summer time is in force at that end. The dropdown labels are fixed text, so Sydney (AEST) can display Australian Eastern Daylight Time.
- Include the date when you share a time, such as 'Fri 16 Oct, 8:30 pm IST', so nobody has to guess.
- Re-run the conversion for the exact date of the meeting rather than today's date.
Common mistakes
- Leaving From as UTC after pressing Now. Your device's local time is then treated as UTC and the result is off by your offset, five and a half hours for India.
- Assuming the gap between two cities is constant. London changes clocks on 25 October 2026 and New York on 1 November 2026, so the gap differs in between. Re-check each date.
- Trusting results on a clock-change day. In our checks, entries on the day clocks change in the From zone, or in your own device's zone, could come out an hour off. Cross-check with a second source.
- Looking for a city that is not listed, such as Karachi, Kathmandu, Colombo or Riyadh. Choose a listed zone with the same offset and rules, and confirm.
Your files and privacy
Date and time conversion happens in your browser using its built-in time zone data, and the values you enter are not sent to a server or saved. The page does record that the tool was opened, through an anonymous request with the tool name and a random session ID kept in your browser, and a Google Analytics event.
Frequently asked questions
Does it account for daylight saving time?
Yes, for the date you enter, using your browser's time zone database. That is why the same Kolkata time converts to different New York times in October and November. The labels in the list are fixed text, so read the long name in the result.
What does the Now button do?
It fills the Date and Time boxes with your device's current local date and time. It does not alter the From zone, so set From to your own zone to get a correct conversion of the present moment.
Why does the date in a result sometimes differ from the date I entered?
Zones far apart can sit on different calendar days. For instance, 11 pm in New York is already the next morning in Kolkata. The date appears in the panel and in the short date column.
Why can a time on a clock-change day be wrong?
Around the hour clocks move, a local time may not exist or may occur twice, and the method used here can land an hour off. Treat conversions on such days as approximate and confirm with the people involved.
Can I add other cities?
No. The tool offers a fixed list of 20 zones. For a place not listed, pick a listed zone that shares its offset and daylight saving rules, and confirm by checking with someone there.
Guide reviewed 2026-10-11 by the useToolify team.
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