Timezone Converter
Convert between any two timezones
Date
From Timezone
To Timezone
––:––
Common Meeting Pairs
New York ↔ London
Typical: +5h
London ↔ Paris
Typical: +1h
New York ↔ Tokyo
+13h or +14h
London ↔ Dubai
+3h or +4h
Los Angeles ↔ London
Typical: +8h
Singapore ↔ Berlin
−6h or −7h
Current Time,Major Cities
Live · updates every 30s
Converting Time Zones Correctly
To convert a time, subtract the source city's UTC offset and add the target's, using the offsets in force on that date. New York is 5 hours behind London for most of 2026, but only 4 hours from March 8 to 29 and from October 25 to November 1, when US and European clocks change on different Sundays. Pick a date, time and two zones above and the converter applies those rules for you.
Daylight Saving Time Dates 2026 and 2027
These are the days the offsets change. Between them, the gap between two cities can be an hour different from what you are used to.
| Region | 2026 starts | 2026 ends | 2027 starts | 2027 ends | Rule |
|---|---|---|---|---|---|
| United States, most of Canada | Mar 8 | Nov 1 | Mar 14 | Nov 7 | 2nd Sunday of March to 1st Sunday of November, at 2:00 AM local |
| European Union, UK | Mar 29 | Oct 25 | Mar 28 | Oct 31 | Last Sunday of March to last Sunday of October, at 01:00 UTC |
| Sydney, Melbourne | Oct 4 | Apr 5 | Oct 3 | Apr 4 | 1st Sunday of October to 1st Sunday of April |
| New Zealand | Sep 27 | Apr 5 | Sep 26 | Apr 4 | Last Sunday of September to 1st Sunday of April |
No clock changes at all: Arizona (outside the Navajo Nation), Hawaii, Puerto Rico, Mexico (since 2022), Japan, China, India, Singapore and the UAE. In July 2026 the US House passed the Sunshine Protection Act to keep daylight time all year, but it has not become law, so US clocks still fall back on November 1, 2026.
Time Difference from New York
How many hours each city is ahead (+) or behind (−) New York. January is US standard time, July is US daylight time.
| City | IANA zone | January | July |
|---|---|---|---|
| Honolulu | Pacific/Honolulu | −5 | −6 |
| Anchorage | America/Anchorage | −4 | −4 |
| Los Angeles | America/Los_Angeles | −3 | −3 |
| Phoenix | America/Phoenix | −2 | −3 |
| Denver | America/Denver | −2 | −2 |
| Chicago | America/Chicago | −1 | −1 |
| Mexico City | America/Mexico_City | −1 | −2 |
| São Paulo | America/Sao_Paulo | +2 | +1 |
| London | Europe/London | +5 | +5 |
| Paris, Berlin | Europe/Paris | +6 | +6 |
| Dubai | Asia/Dubai | +9 | +8 |
| Mumbai, Delhi | Asia/Kolkata | +10:30 | +9:30 |
| Singapore | Asia/Singapore | +13 | +12 |
| Tokyo | Asia/Tokyo | +14 | +13 |
| Sydney | Australia/Sydney | +16 | +14 |
Sydney swings by two hours because it is on daylight time in the northern winter and standard time in the northern summer.
How to Convert by Hand
Worked example
What is 3:00 PM on Monday, September 21, 2026 in New York, in Tokyo?
- Find the source offset for that date. New York is on daylight time: UTC−4.
- Convert to UTC by subtracting the offset: 3:00 PM + 4 hours = 7:00 PM UTC (19:00).
- Find the target offset for that date. Tokyo is UTC+9 all year.
- Add it: 19:00 + 9 hours = 28:00, which is 4:00 AM on Tuesday, September 22 in Tokyo.
Mistakes that cause missed meetings
- Writing EST in summer. EST is UTC−5 only. From March to November New York is on EDT (UTC−4). Write "ET" or use the city name.
- Assuming the gap never changes. The US and Europe change clocks on different weekends, and the southern hemisphere changes in the opposite direction.
- Times that do not exist. 2:30 AM on March 8, 2026 never happens in New York, and 1:30 AM on November 1, 2026 happens twice. Avoid scheduling in those hours.
- Half-hour zones. India is UTC+5:30, Newfoundland UTC−3:30 (UTC−2:30 in summer), Adelaide UTC+9:30 (UTC+10:30 in summer) and Nepal UTC+5:45.
- Forgetting the date. Anything more than a few hours east of you may already be tomorrow.
For a live view of several cities at once, open the world clock; to find a slot that suits a whole team, use the meeting planner.
Method and sources. Conversions use the IANA time zone database built into your browser through the JavaScript Intl API: the wall time you enter is turned into an exact UTC instant using the source zone's offset on that date, then shown in the target zone. Daylight saving dates above were computed from the same database (tzdata 2026b) and match the US rule in 15 U.S.C. 260a and EU Directive 2000/84/EC. Sunshine Protection Act status: US House vote of July 2026, not passed by the Senate as of September 2026.
Timezone Questions
UTC (Coordinated Universal Time) is the primary international time standard against which all other time zones are measured. It is effectively the successor to GMT and does not change with Daylight Saving Time. All time zones are expressed as UTC+ or UTC− an offset. New York is UTC−5 in winter (EST) and UTC−4 in summer (EDT). Tokyo is always UTC+9. Servers, aviation, and international finance all use UTC internally to avoid ambiguity from DST transitions and local conventions.
DST shifts clocks forward by one hour in spring and back in autumn, changing the UTC offset of affected regions. The US switches on the second Sunday of March and first Sunday of November. Europe switches on the last Sunday of March and October. This means the offset between two cities can vary by 1 to 2 hours depending on the time of year. Example: New York to London is 5 hours for most of the year but only 4 hours for a few weeks each spring and fall, because the US changes clocks earlier in March and later in the fall than the UK (in 2026: March 8 to 29 and October 25 to November 1). This converter uses your browser's timezone data to automatically account for current DST status.
London is UTC+1 in summer (BST) and UTC+0 in winter (GMT). New York is UTC−4 in summer (EDT) and UTC−5 in winter (EST). The time difference is typically 5 hours. The best overlap window is 9am to 12pm New York time, which is 2pm to 5pm London time: morning for New York, afternoon for London. Avoid scheduling after 5pm London time (12pm NY) because one party ends their workday. The gap narrows to 4 hours when the US has changed its clocks and the UK has not yet: in 2026 from March 8 to March 29 and from October 25 to November 1.
Los Angeles (Pacific Time) is UTC−8 in winter and UTC−7 in summer. London is 8 hours ahead and Paris and Berlin 9 hours ahead for most of the year (7 and 8 hours for a few weeks in March and late October). Two 9 to 5 workdays do not overlap at all. The usual compromise is 8 to 9 AM Pacific, which is 4 to 5 PM in London and 5 to 6 PM in Paris and Berlin, so one side always has an early start or a late finish.
Many countries do not change their clocks at all: China (entire country stays UTC+8), Japan (UTC+9), India (UTC+5:30), most of Africa, most of Asia (including Singapore, Thailand, Indonesia, UAE, Saudi Arabia), Russia (no clock changes since 2011), and Iceland. In the United States, Arizona does not observe DST (except the Navajo Nation within Arizona). Hawaii also does not observe DST. When scheduling with these regions, the UTC offset stays constant year-round, making conversions simpler.
Step 1: Find the UTC offset of the source timezone. Step 2: Find the UTC offset of the target timezone. Step 3: Calculate the difference: target offset − source offset. Step 4: Add that difference to the source time. Example: Convert 3pm New York (UTC−5) to Tokyo (UTC+9). Difference = +9 − (−5) = +14h. 3pm + 14h = 5am next day. If the result exceeds 24h, subtract 24h and advance the date by one day. This calculator handles this automatically, including date changes.
The International Date Line (IDL) at roughly 180° longitude is where the calendar date changes. Crossing westward advances the date by one day; crossing eastward moves it back. This is relevant for conversions between the Americas and Asia-Pacific: when it is Monday evening in New York, it is already Tuesday morning in Tokyo. The result box in this converter always shows the correct date alongside the converted time, so you can see exactly if the date changes in the conversion.
India Standard Time (IST) is UTC+5:30, a 30-minute offset from its neighbors. This was chosen so that the midday sun would fall as close as possible to solar noon across the geographic center of India. The alternative (UTC+5 or UTC+6) would give a large part of the country a solar noon very far from 12:00 pm on the clock. India does not observe DST, so IST stays at UTC+5:30 year-round. Nepal goes further with UTC+5:45, and New Zealand's Chatham Islands use UTC+12:45 (UTC+13:45 in their summer). These non-standard offsets can complicate scheduling, as half-hour increments must be tracked.
The European Parliament voted in 2019 to abolish DST across the EU, but implementation has stalled due to disagreement over which permanent time to adopt (permanent summer time vs permanent winter time). If different EU countries choose different standards, borders between countries could have large permanent time differences. The arguments against DST include disruption to sleep patterns, negative health effects from the transitions, and reduced energy savings in modern homes. As of 2026, EU member states still switch twice per year while discussions continue.
Airlines always schedule departure and arrival times in local time at the respective airports. A flight from New York (UTC−5) departing at 7pm arriving in London (UTC+0) at 7am the next day is a 7-hour flight. Pilots and air traffic control communicate in UTC (called "Zulu time" in aviation). Flight durations are independent of time zones. In winter, a 14-hour flight from Los Angeles to Tokyo that departs at 11pm Monday arrives at 6am Wednesday local Tokyo time, because crossing the Date Line advances the calendar date. Flying west across the Pacific from the US you lose a calendar day, and flying east back to the US you gain one.
In the US it ends on Sunday, November 1, 2026 at 2:00 AM, when clocks go back to 1:00 AM. In the EU and UK it ends a week earlier, on October 25, 2026 at 01:00 UTC. In 2027 US clocks spring forward on March 14 and fall back on November 7.
EST (Eastern Standard Time) is UTC−5 and applies from November to March. EDT (Eastern Daylight Time) is UTC−4 and applies from March to November. ET means whichever of the two is in force, which is why "ET" or "New York time" is the safer way to write a meeting time.
Because the offset between two places depends on the date. 9:00 AM in New York is 2:00 PM in London on October 1, 2026 but 1:00 PM on October 28, 2026, since Europe has already left daylight time while the US has not.