TimezoneSearch

Time Difference Between Cities

Each city-pair page answers two questions. What time is it there when it is a given time here, and which hours fall inside a 9:00 to 18:00 day on both sides. The live clocks are current civil time. The schedule on the page lists every stretch of the year when the gap is a different number of minutes, because daylight saving rarely starts on the same day in two countries.

The grid assumes both sides keep those hours. Use it to see the shape of the overlap, then adjust for the office you actually have. A Paris lunch, a Dubai afternoon in Ramadan, and a Sydney January are not in the grid. The corridor notes and the articles cover the cases that come up often. 46 pairs have a written note. The other pages are calculators: clocks, the grid, and the year's table. Open them if you need the numbers. They are not guides.

If you only read one thing before a recurring invite, read which time zone owns the invite. The zone on the event holds one city's hour and moves everyone else.

Guides

  • The weeks when the US and Europe are an hour closer

    How the spring and autumn mismatch weeks change a New York to London or Berlin meeting, which side of the invite moves, and what to check when the gap snaps back.

  • Which time zone should own the calendar invite

    The event's time zone holds one city's local hour and moves everyone else. How that choice plays out for London and New York, and how to stop a click on your own calendar from making it for you.

  • A handoff note when there is no shared workday

    What to write at the end of the day when New York and Tokyo, or San Francisco and Singapore, will not both be at a desk. A format, a worked example, and the words that cause the next morning to stall.

  • Scheduling with India without losing the half hour

    Mumbai is UTC+5:30 all year. What 9:00 AM in London, New York, Singapore, and Dubai actually is in Mumbai, and the invite habit that stops someone from 'fixing' it onto the hour.

  • Scheduling with Sydney

    Sydney's clock moves in the opposite season, so the gap with New York, San Francisco, London, and Singapore has more than two settings. Which hour survives, and why January is a bad month to pretend otherwise.

  • Same clock, different calendar

    New York and Toronto, Seoul and Tokyo, Hong Kong and Singapore, Beijing and Singapore. The offset is zero or close to it. The meetings fail on holidays, typhoons, and a week of lunar new year that only one side takes.

  • A worked week for San Francisco, Berlin, and Singapore

    There is no hour when all three cities are inside a normal workday. A concrete weekly design: who meets live, who reads notes, and which local times hold still between January and July.

  • The week the clocks change

    What to check the week a region springs forward or falls back: recurring meetings, on-call handoffs, local-time cron jobs, business-hour SLAs, and the hour that happens twice or not at all.

All articles

Corridors with a scheduling note

Across the Atlantic and the US

London’s afternoon is New York’s morning. San Francisco makes that window an hour thinner. The mismatch weeks, when North America has changed clocks and Europe has not, move the hour for whichever city did not create the invite.

No shared workday, or only a thin one

Some of these pairs have no 9-to-6 in common. Others, London to Tokyo or London to Singapore, have a morning window that disappears if London books an hour later. The note says which evening is a compromise and when to stop meeting live.

Australia

Sydney moves in the opposite season, so the gap has three settings. With New York and San Francisco the date changes as well as the hour. With Singapore the clock is easy and January is not.

India and the Gulf

India is a half hour off the grid, all year. Dubai does not change its clock. Ramadan and the holiday lists do more damage than daylight saving on these routes.

East Asia, where the hour is small

Several of these cities share a clock, or sit one hour apart, and never change for daylight saving. The meetings fail on lunar new year, Chuseok, Obon, or a typhoon signal, not on the offset.

Same hour, or close, with a catch

A zero-hour gap still needs both holiday calendars. A one-hour gap inside Europe does not move when the US changes. Mexico City no longer moves with New York.

Every pair, by city

190 pairs across 20 cities. A link marked "note" has the written scheduling section. The others are calculators you can still open.

Beijing

Berlin

Cairo

Chicago

Dubai

Hong Kong

Istanbul

London

Mexico City

Moscow

Mumbai

New York

Paris

San Francisco

São Paulo

Seoul

Singapore

Sydney

Tokyo

Toronto