Time Zone Converter
Convert a time from one UTC offset to another in seconds.
Example
12:00 in UTC+00:00 (London) converts to UTC+05:30 (India) by adding the 5h 30m difference, giving 17:30 the same day. Converting 23:00 UTC-05:00 to UTC+09:00 lands at 13:00 the next day (+1 day).
How it works
The time is normalized to UTC by subtracting the source offset, then the target offset is added: converted = source time − source offset + target offset. Day rollovers (±1 day) are computed from the total minute difference.
Good to know
The Time Zone Converter takes a single clock time and translates it from one UTC offset to another, so you can instantly see what 12:00 in UTC+00:00 becomes in UTC+05:30 or any other zone. It covers the full practical range from UTC-12 to UTC+14, and includes the unusual fractional offsets — half-hour zones like India (UTC+05:30) and Newfoundland (UTC-03:30), plus quarter-hour zones like Nepal (UTC+05:45) and the Chatham Islands (UTC+12:45) — which many simpler converters skip.
It is built for anyone coordinating across borders: scheduling a call with a remote colleague, picking a webinar slot that works for an overseas audience, planning a flight or travel itinerary, or figuring out when a market opens elsewhere. You pick a time, choose a "from" offset and a "to" offset, and the result updates as you type — no button to press.
Read the output as four linked pieces. The big "Converted time" is your answer; the "Day shift" tells you whether that time lands on the same day, the next day (+1), or the previous day (-1) — critical for late-night and early-morning conversions. The "Offset diff" shows the raw gap between the two zones (for example +5h 30m), and "UTC time" gives you the underlying universal time the conversion is anchored to, which is handy as a neutral reference everyone can agree on.
One caveat worth internalizing: this tool uses fixed UTC offsets and does not adjust for daylight saving time. A place like New York sits at UTC-05:00 in winter but UTC-04:00 in summer, so before you convert, confirm which offset applies on the actual date you care about and select that one — otherwise your result can be off by a full hour.
Frequently asked questions
Does this account for daylight saving time?
No. It uses fixed UTC offsets only. During DST a region may shift by an hour (for example New York moves from UTC-5 to UTC-4), so pick the offset that matches the date you care about.
Why does the result sometimes show a day shift?
When the converted time crosses midnight, the calculator reports +1 or -1 day. For example, late-night times in the Americas often fall on the next calendar day in Asia.
Is my data uploaded anywhere?
No — this calculator runs entirely in your browser. Your inputs never leave your device, and it works offline once loaded.
Is this calculator free?
Yes, completely free with no sign-up and no limits.
People also ask
How do I convert a time from one time zone to another?
Enter the time, choose the source UTC offset under "From" and the destination offset under "To," and the converted time appears instantly. The tool normalizes the time to UTC and then applies the target offset for you.
What is a UTC offset and how is it different from a time zone name?
A UTC offset is the fixed number of hours and minutes a location is ahead of or behind Coordinated Universal Time, such as UTC+05:30. A named time zone like "Eastern Time" can map to two different offsets across the year because of daylight saving, so this tool asks for the offset directly to avoid ambiguity.
Why does the converted time show a different day?
When the conversion crosses midnight, the result lands on a different calendar date, shown as +1 day or -1 day. This commonly happens between far-apart regions, like a late evening in the Americas becoming the following afternoon in Asia.
Does this converter handle half-hour and 45-minute time zones?
Yes. It includes fractional offsets such as UTC+05:30 (India), UTC-03:30 (Newfoundland), UTC+05:45 (Nepal), and UTC+12:45 (Chatham Islands), so conversions involving those regions stay accurate.
Why is the result off by an hour from what my phone shows?
Most likely the difference is daylight saving time, which this tool does not apply automatically. Check whether the region is currently observing DST and select the matching offset — for example UTC-04:00 instead of UTC-05:00 for New York in summer.
What does the UTC time field mean in the result?
It shows the universal time that the conversion is anchored to after removing the source offset. It is useful as a neutral reference point, since UTC is the same everywhere and doesn't shift with daylight saving.
Is my time data sent to a server or stored anywhere?
No. The converter runs entirely in your browser using local JavaScript, so your inputs never leave your device, and it keeps working even when you're offline once the page has loaded.
How do I find the right offset for a city I'm converting to?
Look up the city's current UTC offset, remembering it can change with the season, then pick that value in the dropdown. For example, London is UTC+00:00 in winter and UTC+01:00 during British Summer Time.
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