Quick answer: Every time zone is an offset from UTC, and daylight saving shifts it by an hour in some places for part of the year. When it is 9:00 AM in New York in September (UTC−4), it is 2:00 PM in London (UTC+1), 6:00 PM in Karachi (UTC+5) and 10:00 PM in Tokyo (UTC+9). This tool uses your device’s time zone database, so daylight saving is applied for the exact date.
Scheduling a call across countries means asking “what time is that for them?” and getting it wrong at least once. Daylight saving changes make it worse, because two cities can be 4 hours apart in one month and 5 in another.
This converter uses your device’s built-in time zone database, so daylight saving is applied correctly for the date you choose. Pick the city and the time you know, choose up to four cities to compare, and see each local time, the date (with +1 or −1 day where it differs) and the offset from UTC.
How time zones work
Every time zone is defined by an offset from Coordinated Universal Time (UTC). New York is UTC−5 in winter and UTC−4 in summer, London is UTC+0 and UTC+1, Karachi is UTC+5 all year, and India is UTC+5:30. Some places, such as Nepal (UTC+5:45), use offsets that are not whole hours.
The calculator turns the time you enter into a universal moment using the rules of the city you chose for that date, and then shows that moment in each of the other cities. This is why the results change with the date: daylight saving starts and ends on different days in different countries.
If your own city is not in the list, choose the nearest one in the same time zone. The “Your device” entry at the top of each list uses the time zone your device is set to.
A worked example
Example. When it is 9:00 AM on September 19, 2026 in New York (UTC−4, daylight time), it is 2:00 PM in London (UTC+1), 6:00 PM in Karachi (UTC+5), 10:00 PM in Tokyo (UTC+9) and 11:00 PM in Sydney (UTC+10). A call booked for 11:00 AM in New York would fall at 1:00 AM on September 20 in Sydney, which the tool marks with “+1 day”.
UTC offsets of popular cities
| City | Standard time | Daylight saving time |
|---|---|---|
| New York | UTC−5 | UTC−4 |
| Los Angeles | UTC−8 | UTC−7 |
| London | UTC+0 | UTC+1 |
| Paris and Berlin | UTC+1 | UTC+2 |
| Dubai | UTC+4 | not used |
| Karachi | UTC+5 | not used |
| Delhi and Mumbai | UTC+5:30 | not used |
| Dhaka | UTC+6 | not used |
| Singapore | UTC+8 | not used |
| Tokyo | UTC+9 | not used |
| Sydney | UTC+10 | UTC+11 (October to April) |
Daylight saving dates differ by country and change from year to year, so use the converter for the exact date.
Common mistakes to avoid
- Using a fixed difference all year. The gap between two cities changes when only one of them moves its clocks, so always convert for the actual date.
- Writing “EST” when you mean “Eastern Time”. EST is the winter offset only, and in summer the zone is EDT.
- Forgetting the date changes. Evenings in the Americas are the next morning in Asia and Australia.
Frequently asked questions
How do I convert time between two time zones?
Pick the time and the city you know as the starting point, choose the city you want to compare, and read the result. The tool applies the offsets and daylight saving rules for that exact date.
Why is the time difference sometimes different for the same two cities?
Because daylight saving time starts and ends on different dates in different countries. For a few weeks each year the gap between two cities can change by an hour.
What does +1 day next to a date mean?
It means that in that city it is already the next calendar day. For example, evening in New York can be the following morning in Sydney.
Which time zone is Pakistan or India in?
Pakistan is UTC+5 all year (PKT). India is UTC+5:30 all year (IST). Neither country uses daylight saving time.
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Sources and further reading
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