How to convert a time from one time zone to another
Pick the hour and the city where it applies on the first line, then the city you want on the second line. The big result is the same moment in that city, with the day: same day, next day or previous day. Use “-1 h” and “+1 h” to slide the hour, or the left and right arrow keys on a keyboard. Add more cities below to see the same moment everywhere at once.
The converter starts from the city of your device’s time zone and the current time, so you only have to change what differs. Your cities are kept in this browser for next time.
The math behind the converter
Every local time is UTC plus an offset. To convert, take the difference between the two offsets and add it to the hour. New York is UTC-5 in winter and Paris UTC+1, so the gap is 6 hours: 9:00 AM in New York is 3:00 PM in Paris. Going the other way, subtract: 9:00 AM in Paris is 3:00 AM in New York.
When the result goes past midnight, the date changes. 8:00 PM in Los Angeles (UTC-8) is 1:00 PM the next day in Tokyo (UTC+9), 17 hours later. That is why the converter always shows the day next to the result.
Some offsets include half hours or quarter hours. India is UTC+5:30 and Nepal UTC+5:45, so 12:00 PM in London (UTC+0) is 5:30 PM in Mumbai and 5:45 PM in Kathmandu in winter. Newfoundland, in Canada, is UTC-3:30.
Why the same conversion changes during the year
The offsets themselves move when a city switches to daylight saving time, and countries do not switch on the same day. The United States moves forward on the second Sunday of March, Europe on the last Sunday of March. For those two or three weeks, New York is only 4 hours behind London instead of 5. In the fall, Europe goes back on the last Sunday of October and the US on the first Sunday of November, which creates another week with a shorter gap.
| Region | 2026 | 2027 |
|---|---|---|
| Europe | Forward Sun, Mar 29 Back Sun, Oct 25 | Forward Sun, Mar 28 Back Sun, Oct 31 |
| United States, Canada | Forward Sun, Mar 8 Back Sun, Nov 1 | Forward Sun, Mar 14 Back Sun, Nov 7 |
| Southeastern Australia | Forward Sun, Oct 4 Back Sun, Apr 5 | Forward Sun, Oct 3 Back Sun, Apr 4 |
| New Zealand | Forward Sun, Sep 27 Back Sun, Apr 5 | Forward Sun, Sep 26 Back Sun, Apr 4 |
| Mainland Chile | Forward Sun, Sep 6 Back Sat, Apr 4 | Forward Sun, Sep 5 Back Sat, Apr 3 |
In the southern hemisphere the seasons are reversed, so the gap between Europe and Sydney ranges from 8 hours in July to 10 hours in January, with 9 hours in between. The converter takes all of this into account: change the date on the first line and the result follows the rules in force that day. Since 2026, British Columbia, Alberta and Manitoba no longer change their clocks, and Morocco has gone back to GMT, which shifts some familiar gaps.
Popular time differences
Each pair has its own page with the exact dates when the gap changes in 2026 and 2027, an hour-by-hour table and the best hours to call.
| Cities | Usual time difference |
|---|---|
| Paris and New York | New York 6 hours behind Paris, 5 hours part of the year |
| Paris and Montreal | Montreal 6 hours behind Paris, 5 hours part of the year |
| Paris and London | London 1 hour behind Paris, all year |
| Paris and Tokyo | Tokyo 7 hours ahead of Paris, 8 hours part of the year |
| Paris and Los Angeles | Los Angeles 9 hours behind Paris, 8 hours part of the year |
| Paris and Réunion | Réunion 2 hours ahead of Paris, 3 hours part of the year |
| Paris and Martinique | Martinique 6 hours behind Paris, 5 hours part of the year |
| Paris and Guadeloupe | Guadeloupe 6 hours behind Paris, 5 hours part of the year |
| Paris and French Guiana | French Guiana 5 hours behind Paris, 4 hours part of the year |
| Paris and New Caledonia | New Caledonia 9 hours ahead of Paris, 10 hours part of the year |
| Paris and Tahiti | Tahiti 12 hours behind Paris, 11 hours part of the year |
| Paris and Mauritius | Mauritius 2 hours ahead of Paris, 3 hours part of the year |
| Paris and Dubai | Dubai 2 hours ahead of Paris, 3 hours part of the year |
| Paris and Bangkok | Bangkok 5 hours ahead of Paris, 6 hours part of the year |
| Paris and Beijing | Beijing 6 hours ahead of Paris, 7 hours part of the year |
| Paris and Sydney | Sydney 8 hours ahead of Paris, 10 hours or 9 hours part of the year |
| Paris and India | India 3 hours 30 minutes ahead of Paris, 4 hours 30 minutes part of the year |
| London and New York | New York 5 hours behind London, 4 hours part of the year |
| London and Sydney | Sydney 9 hours ahead of London, 11 hours or 10 hours part of the year |
| London and Dubai | Dubai 3 hours ahead of London, 4 hours part of the year |
| New York and Los Angeles | Los Angeles 3 hours behind New York, all year |
| New York and Tokyo | Tokyo 13 hours ahead of New York, 14 hours part of the year |
| Berlin and New York | New York 6 hours behind Berlin, 5 hours part of the year |
| Berlin and Bangkok | Bangkok 5 hours ahead of Berlin, 6 hours part of the year |
| Rome and New York | New York 6 hours behind Rome, 5 hours part of the year |
| Madrid and Mexico City | Mexico City 8 hours behind Madrid, 7 hours part of the year |
| Madrid and Buenos Aires | Buenos Aires 5 hours behind Madrid, 4 hours part of the year |
| Madrid and Bogotá | Bogotá 7 hours behind Madrid, 6 hours part of the year |
| Lisbon and São Paulo | São Paulo 4 hours behind Lisbon, 3 hours part of the year |
| São Paulo and New York | New York 1 hour behind São Paulo, 2 hours part of the year |
Tips for scheduling across time zones
- Say the time zone. “10 AM ET” or “4 PM Paris time” is clearer than a bare hour. For a group spread over several countries, give UTC.
- Find the overlap first. Between the US East Coast and Western Europe, mornings in New York meet afternoons in Paris. Between the US West Coast and East Asia, late afternoon in California is the next morning in Tokyo or Seoul.
- Mind the date. A Friday call at 2 PM in Los Angeles lands on Saturday morning in Sydney: at 9 AM in January, at 7 AM in July.
- Check again in March, October and November. Recurring meetings drift by one hour for a few weeks when one country has changed its clocks and the other has not.
To see several cities live, open the world clock. Each city also has its own page, such as the current time in New York or the current time in Tokyo.