Time Zone Converter
Remote work, international families, online classes and global customers have made time-zone maths an everyday skill — and it is surprisingly easy to get wrong. A meeting that is 12:00 in New York is 17:00 in London in November, but daylight saving starts and ends on different dates in different countries, so the gap changes through the year. Guessing, or adding a fixed number of hours you remember from last summer, is how people miss flights, join calls an hour late, and wake relatives in the middle of the night. This free time zone converter removes the guesswork. Pick a date and a time, choose the zone it is in and the zone you want it in, and it gives you the exact converted time, including the date when the conversion crosses midnight. It uses your browser's built-in time-zone database for the exact date you enter, so daylight saving is handled correctly for that day, and it needs no internet connection and sends nothing to a server.
Converted Time
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How to Use This Calculator
- Enter the date and time of the event in the place where it happens — the date matters, because daylight saving depends on it.
- Choose the "From" time zone — the zone the time you entered is in.
- Choose the "To" time zone — the zone you want the time in.
- Tap Convert Time. Read the converted date and time, and check whether it falls on a different day.
Understanding Time Zones and Daylight Saving
The world is divided into time zones measured from Coordinated Universal Time, or UTC. A zone written as UTC−5 is five hours behind UTC, and a zone written as UTC+9 is nine hours ahead. The table below lists the zones in this converter with their usual offsets, but the offset is not always fixed: most of the United States, the United Kingdom and Europe move their clocks forward by one hour in spring and back by one hour in autumn for daylight saving time, while India and Japan never change their clocks at all. That is why a converter must know the date, not just the time. New York is UTC−4 in summer (Eastern Daylight Time) and UTC−5 in winter (Eastern Standard Time); London is UTC+1 in summer (British Summer Time) and UTC+0 in winter (Greenwich Mean Time); Sydney is UTC+11 in the southern summer and UTC+10 in the southern winter, which is the opposite season from the northern hemisphere.
The trickiest weeks of the year are the ones when one country has changed its clocks and the other has not. In 2026 the United States ends daylight saving on 1 November, while the United Kingdom ended it a week earlier, on 25 October, so for that one week the gap between New York and London is four hours, and after 1 November it returns to five hours. The same thing happens in spring: the United States starts daylight saving on 8 March 2026 and Europe starts on 29 March, so the gap is four hours for three weeks in between. When a meeting repeats across time zones, agree the time in UTC, which never changes, and let each person convert it for their own clock.
This converter handles all of that using the time-zone database built into your browser, which knows the daylight saving rules for the date you enter. It does not use any external service or API, so it works offline and your entries stay on your device. One warning: the hours around a clock change can be ambiguous — when clocks go back, the same local time happens twice — and times during the "spring forward" gap do not exist at all.
Time Zone Offsets
| Zone | Standard offset | Daylight saving offset | Daylight saving? |
|---|---|---|---|
| UTC | UTC+0 | UTC+0 | No |
| US Eastern (New York) | UTC−5 | UTC−4 | Yes, Mar–Nov |
| US Central (Chicago) | UTC−6 | UTC−5 | Yes, Mar–Nov |
| US Mountain (Denver) | UTC−7 | UTC−6 | Yes, Mar–Nov |
| US Pacific (Los Angeles) | UTC−8 | UTC−7 | Yes, Mar–Nov |
| UK (London) | UTC+0 | UTC+1 | Yes, Mar–Oct |
| Central Europe (Berlin, Paris) | UTC+1 | UTC+2 | Yes, Mar–Oct |
| India (Kolkata) | UTC+5:30 | UTC+5:30 | No |
| Japan (Tokyo) | UTC+9 | UTC+9 | No |
| Australia (Sydney) | UTC+10 | UTC+11 | Yes, Oct–Apr |
Worked Example
Example — 12:00 on 7 November 2026 in New York to London: On 7 November 2026 the United States has already ended daylight saving (it ended on 1 November), so New York is on Eastern Standard Time, UTC−5, and 12:00 there is 17:00 UTC. London ended daylight saving on 25 October, so it is on Greenwich Mean Time, UTC+0, and 17:00 UTC is 17:00 in London — five hours ahead of New York. Enter 7 November 2026, 12:00, from New York to London above to see exactly that result.
Example — the same time in summer: On 7 July 2026 both cities are on daylight saving: New York is UTC−4 and London is UTC+1, so 12:00 in New York is 16:00 UTC and 17:00 in London again. Now try 12:00 on 7 November 2026 from New York to Tokyo: Tokyo is UTC+9, fourteen hours ahead of Eastern Standard Time, so the answer is 02:00 on 8 November — the next day.
Frequently Asked Questions
What time is 12:00 in New York in London on 7 November 2026?
It is 17:00 in London. By 7 November 2026 the United States has returned to Eastern Standard Time (UTC-5), after daylight saving ended on 1 November, while London is on Greenwich Mean Time (UTC+0), so London is five hours ahead.
How does this converter handle daylight saving time?
It uses your browser's built-in time-zone database for the exact date you enter, so daylight saving is applied only when it is in effect on that date. The same clock time can convert differently in summer and winter, which is why the date matters as much as the time.
Why did my meeting time change after daylight saving ended?
Because the United States and Europe change their clocks on different dates, the gap between two cities can change by an hour for a few weeks each year. A meeting fixed in one time zone shifts by an hour in the other until both places have changed their clocks.
Does this converter need the internet to work?
No. It uses the time-zone database built into your browser and the fixed offsets listed on this page, so it works offline. No date, time or location you enter is sent to a server.
What is the difference between UTC and GMT?
UTC is the precise time standard the world uses, and GMT is the time zone used in London in winter. For everyday converting they are the same: London is on GMT, which is UTC+0, in winter, and on British Summer Time, UTC+1, in summer.