Compare Multiple Time Zones (World Clock & Meeting Planning)
Add as many locations as you like to compare them side by side. Leave it on "Live" for a running world clock, or switch to "Use date & time above" to see what each location's local time will be at the exact date and time you set in the converter — handy for planning a call or meeting across several time zones at once.
Supported Time Zones
This converter reads its time zone list directly from your browser's built-in IANA time zone database, so it supports hundreds of zones worldwide (in older browsers without that API, a curated list of major cities is used instead). Popular zones like New York, London, Dubai, Karachi, Mumbai, Singapore, Tokyo, and Sydney are available immediately in the search box, alongside UTC itself.
How Time Zone Conversion Works
Pick Date, Time & Zones
Choose the date, time, and the "From" and "To" time zones.
Rules Applied Automatically
The correct UTC offset and daylight saving rule for that exact date is applied on both sides.
See the Result
Converted time, date, offsets, and the time difference appear instantly.
A time zone conversion depends on more than just a fixed number of hours: it depends on the origin zone, the destination zone, and the specific date, because daylight saving changes and historical time zone rules can shift the correct offset. This tool always recalculates the true offset for the date you select rather than assuming a fixed difference between two cities.
UTC (Coordinated Universal Time)
UTC is the reference time standard the world is built around, and it does not change for daylight saving. Every time zone's offset — such as UTC−5 or UTC+5:30 — is defined relative to it. You can convert to or from UTC directly in this tool: just type "UTC" into either the From or To field, the same way you'd search for any other city or zone.
Daylight Saving Time (DST)
Daylight saving time is the practice, used by some but not all countries and regions, of moving clocks forward by an hour in spring and back again in autumn. Because the exact transition dates vary by location and can even change from year to year, this converter never assumes a fixed offset for a zone — it checks the specific date you've entered and applies whichever rule was, or will be, in effect on that date, according to your browser's time zone data.
A note on edge cases: near a DST transition, a local time can technically be skipped entirely (the "spring forward" gap) or occur twice (the "fall back" repeat). This converter resolves those moments the same way your browser's own clock does, which is a reasonable default for the vast majority of conversions, but is worth keeping in mind if you're converting a time that falls exactly within a transition hour.
Time Zone Data & Accuracy
Intl API) rather than a
hand-maintained list of fixed offsets, so it reflects
real daylight saving and historical time zone rules.
Time zone rules can change when governments modify
local time or daylight saving policies; results are
based on the time zone data available in your browser
at the moment of calculation, and very far future dates
carry some inherent uncertainty that no converter can
fully guarantee against.
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Frequently Asked Questions
What is a time zone converter?
A time zone converter takes a date and time in one location and works out the equivalent date and time in another location, automatically accounting for each location's UTC offset and daylight saving rules.
This tool uses your browser's built-in IANA time zone data, so it applies the same rules governments and standards bodies actually use.
How do I convert time between time zones?
Pick a date and time, choose a "From" time zone and a "To" time zone, and the result updates automatically — no button needed.
Use the swap button to flip the two zones, and the result will show the converted time, date, UTC offsets, and whether the conversion crosses into a different day.
What is UTC?
UTC (Coordinated Universal Time) is the primary time standard the world uses to regulate clocks and time, and it does not observe daylight saving time.
Every time zone's offset is expressed as a difference from UTC, such as UTC−5 or UTC+5:30, and UTC is available as one of the selectable zones in this converter.
What is the difference between UTC and GMT?
UTC and GMT (Greenwich Mean Time) represent the same time in practice and are often used interchangeably.
Technically, UTC is the precise, internationally defined time standard, while GMT is a specific time zone (used in the UK outside of British Summer Time) historically based on solar time at Greenwich — for everyday conversion purposes, the two are equivalent.
Why does the time difference change during the year?
The time difference between two locations can change when one or both of them observe daylight saving time, since clocks move forward or backward by an hour at different times of year.
Not every country or region uses DST, so this converter recalculates the correct offset for the specific date you select rather than assuming a fixed difference.
What is daylight saving time?
Daylight saving time (DST) is the seasonal practice of setting clocks forward by an hour (usually in spring) and back again (usually in autumn) to make better use of natural daylight.
Not all countries or regions observe DST, and the exact start and end dates vary by location, which is why this converter checks the specific date entered rather than using one fixed offset per zone.
How accurate is a time zone converter?
This converter relies on your browser's built-in IANA time zone database, the same standardized data source used by most operating systems and major software, so it reflects current daylight saving rules and known historical changes.
Time zone rules can occasionally change when governments modify local time or DST policies, and results reflect whatever time zone data is available in your browser at the moment of calculation.
How are time zones determined?
Time zones are set by national and regional governments, not by a single global authority, and are based loosely on longitude but adjusted for political, economic, and practical convenience.
The IANA Time Zone Database tracks these boundaries and their history worldwide, including every recorded daylight saving and offset change, and is the data source behind this converter.
Can time zones have different UTC offsets during the year?
Yes. Any location that observes daylight saving time has at least two UTC offsets across the year — one for standard time and one for daylight time — and exact transition dates can even change from year to year in some countries.
This converter always calculates the offset for the specific date and time you select rather than a single fixed value.
What happens when a conversion crosses midnight?
If converting a time from one zone to another lands on a different calendar date, this converter clearly labels the result with its own date, and notes whether it falls on the next day or the previous day relative to your input.
This is common for large time differences, such as converting evening times from the Americas to Asia-Pacific zones.
Can I convert time for a future date?
Yes, you can select any future date supported by your browser's date input.
Keep in mind that future daylight saving and time zone rules can still change if a government changes its local time policy, so very far future conversions carry some inherent uncertainty that no converter can fully guarantee against.