Time Zone Converter

A time zone converter reads one moment on several clocks at once.

Time in another zone = UTC time + that zone's offset

Every clock on Earth shows the same instant in a different way. The converter first turns your date and time into that single instant, measured in Coordinated Universal Time (UTC), and then reads it off each zone in the list by adding the zone's offset. Eastern Standard Time is 5 hours behind UTC, so its offset is −5. India is 5 hours 30 minutes ahead, so its offset is +5:30.

The offsets change with daylight saving time, so the date matters as much as the time. The converter uses the time zone rules built into your browser, the same tables your phone's clock uses, and applies the rule for the date you pick in every zone. When a row lands on a different calendar day, it says so, and each row is tagged by whether the time falls inside 9 AM to 5 PM on that zone's own clock.

9:00 AM Eastern on Tuesday, November 3, 2026 is 6:00 AM Pacific and 2:00 PM in London.

That is the example the page is built on. Daylight saving time ended in the United States two days earlier, so New York is back on Eastern Standard Time, 5 hours behind UTC.

• In UTC: 9:00 AM + 5 hours = 2:00 PM, written 14:00 UTC.
• Chicago, on Central Standard Time (−6): 8:00 AM.
• Denver and Phoenix, both on Mountain Standard Time (−7): 7:00 AM.
• Los Angeles, on Pacific Standard Time (−8): 6:00 AM.
• Anchorage (−9): 5:00 AM. Honolulu (−10): 4:00 AM.
• London, on Greenwich Mean Time (+0): 2:00 PM, the same as UTC.

Run the same 9:00 AM the week before, on Wednesday, October 28, and some of those answers move. New York is still on daylight time (EDT, −4), so the moment is 13:00 UTC: London shows 1:00 PM, Phoenix 6:00 AM and Honolulu 3:00 AM, because Arizona and Hawaii never left standard time, while Denver still shows 7:00 AM, on MDT. For an hour count rather than a clock reading, such as a call or a shift that runs past midnight, the time duration calculator measures the gap between two dates and times.

Federal law divides the United States into nine time zones.

15 U.S.C. 261 says “the territory of the United States shall be divided into nine zones,” the first 4 hours behind UTC and the ninth 10 hours ahead of it, and leaves the lines between them to an order of the Secretary of Transportation. 49 CFR 71.1 names them: Atlantic, Eastern, Central, Mountain, Pacific, Alaska, Hawaii-Aleutian, Samoa and Chamorro. The Chamorro zone covers Guam and the Northern Mariana Islands, which is why the ninth zone is ahead of UTC while the other eight are behind it.

The table on NIST's local time page gives each zone its standard and daylight abbreviation and offset. Six of the nine move to daylight time in summer. Atlantic, Samoa and Chamorro stay on standard time all year, and NIST notes that none of the US territories on Atlantic time change their clocks.

Daylight saving time lasts 238 days in 2026, and Hawaii and most of Arizona skip it.

15 U.S.C. 260a moves the clocks forward at 2 a.m. on the second Sunday of March and back at 2 a.m. on the first Sunday of November, and lets a state exempt itself. NIST gives the 2026 dates as March 8 to November 1, which makes daylight time 238 days long, “or about 65% of the year.” NIST also lists the places that stay put: “Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands and most of Arizona do not observe DST,” while the Navajo Nation in Arizona does.

That one exemption makes Phoenix easy to get wrong. In winter it shows the same time as Denver. In summer it shows the same time as Los Angeles, because Pacific Daylight Time and Mountain Standard Time are both 7 hours behind UTC. It is also why ET is a safer label than EST for a recurring meeting: ET means whichever Eastern time is in force, and NIST notes that the standard or daylight label can be left off for year-round uses such as business hours.

One hour a year does not exist at all. On March 8, 2026, New York clocks jump from 2:00 AM to 3:00 AM, so 2:30 AM never happens. The converter reads such a time the way a phone calendar does, as 3:30 AM daylight time, and says so under the result.

For four weeks in 2026, New York and London are four hours apart instead of five.

The United Kingdom changes its clocks on different Sundays. GOV.UK says “the clocks go forward 1 hour at 1am on the last Sunday in March, and back 1 hour at 2am on the last Sunday in October,” which in 2026 is March 29 and October 25. The US moved on March 8 and moves back on November 1. Between those dates, New York is on daylight time while London is not, and the usual 5-hour gap shrinks to 4.

• March 8 to March 29, 2026: 21 days at 4 hours apart.
• October 25 to November 1, 2026: 7 days at 4 hours apart.
• The rest of the year: 5 hours apart, so a 9:00 AM New York call is 2:00 PM in London.

A weekly meeting set by a fixed time in one city moves by an hour in the other for those weeks, and it is easy to miss. NIST puts the wider problem plainly: “There is no single body that regulates time zones or daylight saving time around the world,” and countries in the southern hemisphere change their clocks at the opposite time of year. Converting by date, not by a remembered offset, avoids all of it.

A team in Los Angeles, New York and London shares no regular working hour.

Take an invented team with one person in each city, each working 9 AM to 5 PM on their own clock, on Tuesday, November 3, 2026. On New York time, London works from 4:00 AM to noon and Los Angeles from noon to 8:00 PM.

• New York and Los Angeles share 5 hours, from noon to 5:00 PM Eastern.
• New York and London share 3 hours, from 9:00 AM to noon Eastern.
• Los Angeles and London share none: London stops at the moment Los Angeles starts, so the three of them have no hour in common.

The “Working hours in common” panel under the converter does this count for any list of zones and any date, in 15-minute steps so half-hour zones such as India count correctly. Zero is a real answer, and it is worth knowing before a team settles on a standing meeting. Plenty of people now work away from the office: the BLS job flexibilities survey for 2024-25 found that 51 million wage and salary workers, 34%, did some of their work at home, and 56 million, 37%, could. For deadlines across offices, the business days calculator and the date calculator count the days, and the military time converter turns a 24-hour schedule into AM and PM.

A team spread across time zones gives fewer chances to notice someone drifting away.

A converter tells you when everyone is awake. It cannot tell you who is quietly losing interest, and on a team that shares three hours a day or none, the usual signs are easy to miss: fewer messages, a camera that stays off, a calendar that empties. TeamPredict reads public LinkedIn signals to flag resignation risk early, wherever people work, so a departure shows up as a warning while there is still time to talk, rather than as a notice period that starts on someone else's clock.