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Open toolHome › Tools › Developer Tools › Timezone Converter
Timezone Converter — Free Online Time Zone Tool
Convert any time between two time zones instantly — no signup, runs in your browser.
All conversion uses your browser’s built-in
Intl.DateTimeFormat. No data leaves your device.
Converted time
Recent conversions
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Open toolCommon use cases
- Scheduling a meeting across multiple time zones — A product manager in Tel Aviv wants to book a call at 10 AM IST with a team member in New York. Select Asia/Jerusalem as the source, enter 10:00 AM on the meeting date, select America/New_York as the target. The result shows the equivalent New York time — 3 AM EDT — before the booking is confirmed and the time-zone mistake is made.
- Verifying a Unix timestamp or log time — A developer sees an error log timestamped 2026-06-25T14:30:00Z (UTC) and needs to know what that was in their local timezone (Asia/Jerusalem). Set the source to UTC, enter the date and time from the log, set the target to Asia/Jerusalem. The result shows the equivalent local time and day of week — confirming whether the event happened during business hours or overnight.
- Confirming a deadline across international offices — A freelancer in São Paulo receives a brief that says the submission deadline is "Friday 17:00 London time." They need to know what that is in America/Sao_Paulo to set their own alarm. Select Europe/London as source, enter Friday 17:00, select America/Sao_Paulo as target. The converted time and UTC offset strip show the exact local deadline.
- Checking cron job fire times in local time — A DevOps engineer configures a cron job to run at 03:00 UTC on a cloud server. They want to know when that fires in their local timezone (America/Los_Angeles) for monitoring purposes. Set source to UTC, enter 03:00 on a representative date, set target to America/Los_Angeles. The result shows the local fire time including whether DST is in effect on that date.
- Planning remote-worker availability windows — A team lead in Europe/Berlin wants to find a window that overlaps with a teammate in Asia/Tokyo. They run two conversions: "What is 09:00 Berlin in Tokyo?" and "What is 17:00 Berlin in Tokyo?" — defining both ends of the Berlin workday in Tokyo time. The UTC offset comparison strip shows the 7-hour difference at a glance.
Timezone Converter is a free, browser-based tool that converts any date and time from one IANA timezone to another — instantly, with no server request. Enter a date, a time, and two timezones, then click Convert to see the equivalent local time in the target zone along with the UTC offsets for both sides.
How timezone conversion works
Every timezone on Earth is expressed as an offset from Coordinated Universal Time (UTC). UTC+3 is three hours ahead of UTC; UTC−5 is five hours behind. This tool uses the browser's built-in Intl.DateTimeFormat API and the IANA timezone database — the same source that powers your operating system's clock — to look up the correct offset for each zone, including Daylight Saving Time adjustments, and compute the converted time. The result shows the full timezone name (e.g. Israel Standard Time), the UTC offset for that moment (e.g. UTC+3), the day-of-week, and a copyable ISO 8601 timestamp with offset.
Daylight Saving Time (DST)
DST shifts a timezone's UTC offset forward by one hour during summer months, then back in autumn. Not all regions observe DST — Arizona, Japan, and most of Africa do not — and transitions happen on different dates in different countries. The IANA timezone database includes full historical and current DST rules for every zone. This tool applies those rules correctly for the date you enter: the converted time reflects the actual offset in effect on that specific day, not just the zone's standard offset. For times in the ambiguous fall-back hour when clocks repeat, the tool shows the DST-adjusted (earlier) interpretation.
When to use this vs. a world clock
This tool is optimized for a single conversion: "What time is 3 PM Eastern in Israel on Thursday?" It does not show multiple timezones simultaneously or update in real time. For scheduling meetings across five timezones or browsing current times in many cities at once, a world clock is the right fit. For any specific single-moment conversion question, this tool is faster: two selects, a date, a time, one click.
Browser support
The Intl.DateTimeFormat API with full IANA timezone support is available in Chrome 24+, Firefox 52+, Safari 10+, and Edge 18+ — effectively all browsers in use today. The tool detects support at load time and shows a fallback message on unsupported browsers. On iOS and Android, the tool automatically uses the native timezone selector instead of the custom searchable combobox to avoid the virtual keyboard covering the dropdown list.
Frequently asked questions
Does this tool handle Daylight Saving Time?
Yes. The tool uses the browser's built-in IANA timezone database, which includes full DST rules for every zone. The converted time reflects the actual offset in effect on the date you entered — summer time or standard time, whichever applies. If you enter a time during the ambiguous fall-back hour when clocks go back, the tool shows the DST-adjusted (earlier) interpretation. A specific DST-gap warning will be added in a future update.
What timezone format does this tool use?
All timezones use the IANA timezone database identifiers, such as America/New_York, Europe/London, and Asia/Jerusalem. These are the same identifiers used in programming languages (Python datetime, JavaScript Intl, PHP DateTimeZone) and operating systems. The copy value is formatted as ISO 8601 with the UTC offset included, for example 2026-06-25T18:30:00+03:00.
Is the conversion done on a server?
No. All conversion runs in your browser using the Intl.DateTimeFormat API built into every modern browser. Your date, time, and timezone inputs are never sent to a server. The tool works offline after the page has loaded for the first time.
What is a UTC offset?
A UTC offset is the difference between Coordinated Universal Time (UTC) and the local time in a given timezone. UTC+3 means the local time is 3 hours ahead of UTC; UTC−5 means the local time is 5 hours behind. Offsets can change during Daylight Saving Time transitions: a timezone that is UTC+2 in winter may become UTC+3 in summer. The offset shown in this tool reflects the offset in effect on the specific date and time you entered.
Can I convert the same timezone pair repeatedly?
Yes. The tool saves your last 5 conversion pairs in your browser's local storage. After the first conversion, a "Recent conversions" section appears below the tool. Click any entry to restore those settings instantly. Recent history is stored only in your browser — it is never uploaded or shared.