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New YorkAmerica/New_York
09:36:00
Thu, Jul 16 · UTC-04:00
Time Zone Converter
Convert any date and time between 600+ IANA timezones. Live world clock, meeting planner with work-hours overlap detection, and a 24-hour availability heatmap — DST-aware, zero dependencies, 100% private.
Source: 13:36 on 2026-07-16 in UTC (UTC+00:00)
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LondonEurope/London
14:36:00
Thu, Jul 16 · UTC+01:00
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TokyoAsia/Tokyo
22:36:00
Thu, Jul 16 · UTC+09:00
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DubaiAsia/Dubai
17:36:00
Thu, Jul 16 · UTC+04:00
Add timezone
How to use the timezone converter
On the Converter tab, enter a date and time, then select the source timezone from the dropdown. All target timezone cards update instantly. Click Now to pre-fill the current date and time. Use the search bar to add any of the 600+ IANA timezones as a target — or remove ones you do not need. Click the copy icon on any card to copy that time to your clipboard.
The World Clock tab shows a live ticking clock for each timezone you add. Times update every second using your browser's clock.
The Meeting Planner tab helps find a meeting time that works for participants in different parts of the world. Add each participant's timezone, set your work hours window (e.g. 09:00–18:00), and the planner highlights all UTC hours where everyone is within their work window. The 24-hour heatmap gives a visual overview — green for full overlap, yellow for partial, grey for none.
UTC offsets and DST explained
UTC (Coordinated Universal Time) is the global reference clock. It has no daylight saving offset and never changes — all other timezones are defined as a positive or negative offset from it. For example, New York is UTC−5 in winter and UTC−4 during daylight saving time (summer).
Daylight saving time (DST) shifts clocks forward by one hour in spring and back in autumn in countries that observe it. About 70 countries use DST, but transition dates vary — the US and EU switch on different dates, and some countries like India, China, and Japan do not observe DST at all.
This converter uses IANA timezone names (e.g. America/New_York, Asia/Kolkata) via the browser's built-in Intl API. IANA timezone names encode the full historical DST rules for each location, so the correct offset is applied automatically for any date you enter — past, present, or future.
Common timezone conversions
EST / EDT (New York) — UTC−5 in winter, UTC−4 in summer. DST starts second Sunday in March, ends first Sunday in November.
GMT / BST (London) — UTC+0 in winter, UTC+1 in summer. DST starts last Sunday in March, ends last Sunday in October.
CET / CEST (Paris, Berlin) — UTC+1 in winter, UTC+2 in summer. Same DST schedule as London.
IST (India) — UTC+5:30, no DST. India uses a fixed half-hour offset year-round.
GST (Dubai, Abu Dhabi) — UTC+4, no DST. The Gulf region does not observe daylight saving time.
JST (Tokyo) / CST (Shanghai) — UTC+9 and UTC+8 respectively, neither observes DST.
Features
- 600+ IANA timezones — full browser Intl.supportedValuesOf support
- DST-aware — correct offset applied automatically for any date
- Live world clock — second-by-second updates for all added timezones
- Meeting planner — configurable work-hours window, overlap detection
- 24-hour availability heatmap — visual green/yellow/grey coverage
- Popular timezone quick-select with country flag indicators
- Full timezone search — find any IANA zone by name or city
- One-click copy for any converted time
- Zero dependencies — uses the browser Intl API, nothing downloaded
- 100% private — all conversion runs in your browser, no data sent anywhere
Frequently asked questions
What is UTC and why is it used as a reference?
UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. It has no daylight saving offset and never changes, making it ideal as a fixed reference for conversions and timestamps. All other timezones are defined as a positive or negative offset from UTC — for example, New York is UTC−5 in winter and UTC−4 during DST.
What is the difference between a UTC offset and a timezone?
A UTC offset (e.g. UTC+5:30) is a fixed number describing how far a time is from UTC at a specific moment. A timezone (e.g. Asia/Kolkata) is a named region with a full set of DST rules. Two locations can share the same UTC offset right now but switch to different offsets at different DST dates. IANA timezone names are the only reliable way to convert accurately across DST boundaries.
How does daylight saving time affect timezone conversion?
DST shifts clocks forward by one hour in spring and back in autumn in countries that observe it. London, for example, is UTC+0 in winter (GMT) and UTC+1 in summer (BST). This converter is DST-aware — it uses IANA timezone names via the browser Intl API, which automatically applies the correct offset for the exact date you enter.
What is an IANA timezone?
The IANA Time Zone Database (also called the Olson or tz database) is the global standard for timezone definitions. It uses Region/City identifiers — e.g. America/New_York, Europe/London, Asia/Kolkata — that encode the full historical and future DST rules for each location. This converter supports all 600+ IANA timezones.
How do I find a good meeting time across multiple timezones?
Use the Meeting Planner tab. Add each participant's timezone, set your work hours window, and the planner shows all UTC hours where everyone is within their work window. The 24-hour heatmap makes it easy to spot the best windows — green cells mean all participants are available, yellow means partial overlap, grey means no overlap.
Why do some timezones have a 30 or 45-minute offset?
Most timezones use whole-hour offsets from UTC, but some use fractional offsets for historical or political reasons. India Standard Time is UTC+5:30, Nepal Time is UTC+5:45, Iran Standard Time is UTC+3:30, and Australian Central Time is UTC+9:30. These exist because the countries chose to align with local solar time rather than the nearest whole-hour UTC offset.