Browser Tools
What is my timezone?
See the timezone your browser reports, your UTC offset and your current local time.
Your timezone
Detecting…
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Time details
- Local time
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- UTC time
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- Unix timestamp
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- ISO 8601
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- Daylight saving
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- Locale
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How your browser knows your timezone
Your browser asks the operating system, which knows the timezone you selected during setup or
that was chosen for you by location services. The value is exposed through
Intl.DateTimeFormat().resolvedOptions().timeZone and is reported as an IANA identifier
— a Region/City name such as Europe/Berlin.
Crucially, this has nothing to do with your IP address. The two are independent signals, which is why comparing them is such a reliable way to spot a VPN.
Why offsets are not timezones
An offset is a snapshot; a timezone is a rulebook. America/New_York is UTC−05:00 in
January and UTC−04:00 in July, and the exact transition dates have changed several times by legislation.
Storing -05:00 throws away everything needed to compute the next transition correctly.
The practical rule for developers: store timestamps in UTC, store the user's IANA timezone name separately, and convert only at display time. Storing local time with an offset is the root of a large share of scheduling bugs.
Daylight saving time
Roughly a third of the world observes daylight saving, on dates that vary by country and change by legislation more often than most people expect. The IANA timezone database tracks all of it and ships updates several times a year — which is why keeping that database current matters on any system that handles scheduling.
Timezone as a fingerprinting signal
Timezone is a modest but useful fingerprinting input: it narrows a visitor to one of a few
dozen populated regions. Its real value to trackers is cross-checking — a connection from a
Dutch IP address whose browser reports Asia/Baghdad is visibly proxied.
Everything on this page is read in your browser and displayed directly. Nothing is sent to our servers. See the full list of what your browser exposes on the browser info page.
Frequently asked questions
What is my timezone?
The tool above shows the IANA timezone identifier your browser reports, such as Europe/London or Asia/Baghdad, along with your current UTC offset and local time. It comes from your operating system clock settings, not from your IP address.
Why does my timezone not match my IP location?
Because they come from different sources. Timezone is read from your device’s clock settings; location is estimated from your IP address. A VPN changes the second and not the first, so a mismatch usually means a VPN or proxy is in use — or simply that you are travelling with your laptop clock unchanged.
What is a UTC offset?
It is how far your local time sits ahead of or behind Coordinated Universal Time. UTC+03:00 means your clock reads three hours later than UTC. Offsets are not fixed to a timezone: most regions shift by an hour for daylight saving, which is exactly why software should store an IANA timezone name rather than a raw offset.
Why do developers use IANA timezone names?
Because a name like America/New_York encodes the full history and future rules of that region — when daylight saving starts, when it ends, and every past change. An offset like -05:00 is only correct until the next transition, which is how "the meeting is an hour off twice a year" bugs happen.