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How to Convert Time Zones
Time zone conversion can be tricky, especially with daylight saving time changes happening at different dates around the world. Our converter uses your browser's built-in Intl API, which has accurate DST data for every time zone on the planet. Whether you are scheduling a video call with a client in Tokyo, planning a product launch across European and American markets, or simply trying to figure out when to phone a friend in another country, this tool gives you the right answer instantly.
How to Use This Tool
- Select the source time zone — use the "From Time Zone" dropdown. Popular cities like London, New York, Tokyo, and Sydney appear at the top for quick access. All 400+ IANA zones are available below.
- Enter a date and time — set the date using the date picker and type or select the time you want to convert. Click "Use Now" to instantly fill in the current date and time from your device.
- Select the destination time zone — use the "To Time Zone" dropdown to pick where you want to convert the time to.
- Click Convert — the tool displays the converted time along with the UTC offset for both zones, so you can see exactly how many hours ahead or behind each zone is.
- Swap or copy — click "Swap" to reverse the direction, or "Copy Result" to copy the conversion to your clipboard for pasting into emails or calendar invitations.
How It Works Behind the Scenes
The converter relies entirely on the JavaScript Intl API, which is built into every modern browser. When you select a time zone and enter a date, the tool uses the Intl.DateTimeFormat constructor with the specified IANA time zone identifier to format the date in that zone. To perform the actual conversion, it calculates the UTC offset of the source zone for the given date, converts the input time to UTC, and then formats the result in the destination zone.
This approach is both reliable and privacy-friendly. The IANA Time Zone Database that powers the Intl API is the same authoritative source used by operating systems, programming languages, and web servers worldwide. It is updated several times per year to reflect changes in time zone rules and daylight saving schedules. Because the conversion happens entirely in your browser, no data is ever sent to a server — your times, dates, and zone selections remain completely private.
Daylight saving time transitions are handled automatically. If you enter a date that falls during a DST change period, the tool uses the correct offset for that specific date. This means you do not need to worry about whether clocks have sprung forward or fallen back — the converter accounts for it.
Frequently Asked Questions
Does this converter handle daylight saving time?
Yes. The converter uses the browser's built-in Intl API which automatically accounts for DST transitions in every time zone. The result always reflects the correct offset for the specific date you enter. This means you do not need to manually adjust for spring-forward or fall-back changes — the tool handles it for you based on the official transition dates for each zone.
How many time zones are supported?
All IANA time zones are supported — over 400 entries covering every city and region worldwide, from America/New_York to Asia/Kolkata and everything in between. The list is grouped with popular zones at the top for convenience, and the full alphabetical list below. If a location has an IANA identifier, it is available in the dropdown.
Is my data stored?
No. All conversions happen entirely in your browser using JavaScript. No data is sent to any server and Daytics does not track, log, or store the times, dates, or zones you convert. Your privacy is fully protected because there is simply no server-side component involved in the conversion process.
What is the difference between UTC and GMT?
UTC (Coordinated Universal Time) and GMT (Greenwich Mean Time) are often used interchangeably in casual conversation, but they are technically different. UTC is a precise time standard maintained by atomic clocks and is the basis for civil time worldwide. GMT is a time zone historically defined by solar time at the Royal Observatory in Greenwich, London. For most practical purposes the two are identical, but UTC is the standard used in computing, aviation, and international communications.
Why do some time zones have half-hour or 45-minute offsets?
Most time zones are offset from UTC by whole hours, but several regions use fractional offsets for historical or geographical reasons. India uses UTC+5:30, Nepal uses UTC+5:45, and the Chatham Islands near New Zealand use UTC+12:45. These offsets exist because the countries chose a time that best aligns with their solar noon rather than rounding to the nearest whole hour. Our converter handles all of these fractional offsets correctly.
How do I know if a country observes daylight saving time?
Whether a country observes DST depends on its government's legislation. Most of Europe and North America observe DST, while most of Asia, Africa, and South America do not. Australia has a mix, with some states observing DST and others not. The converter does not require you to know this — it automatically applies the correct offset based on the date and zone you select, so the result is always accurate regardless of DST status.
