For meetings or trips, start with the city, event date, local time and UTC offset. New York’s difference from Tokyo changes by one hour with daylight saving time. The world clock shows the current dates and times for cities including Tokyo, New York and London, with each difference from Tokyo.

Calculate a time difference and a date rollover

Subtract nine hours from January 15 at 08:00 in Tokyo, then apply New York standard time to get 18:00 the previous day.
Tools Hub original diagram showing the order of decisions. Enlarge diagram
Tokyo date and time Destination offset Local result
2027-01-15 08:00 New York UTC−05:00 January 14, 18:00, previous day
2027-01-15 21:00 New York UTC−05:00 January 15, 07:00, same day
2027-07-15 21:00 New York UTC−04:00 July 15, 08:00, same day
2027-01-15 23:00 Sydney UTC+11:00 January 16, 01:00, next day
Subtract Tokyo's nine hours from 08:00 to get 23:00 UTC on the previous day. Apply New York's standard offset of −5 hours to get 18:00 on that date. Reverse the sign of the difference to convert the other way.

London and New York daylight-saving dates in 2026 and 2027

City 2026 start → end 2027 start → end Local clock shift
London (Europe/London) Mar 29 → Oct 25 Mar 28 → Oct 31 Spring 01:00→02:00, autumn 02:00→01:00
New York (America/New_York) Mar 8 → Nov 1 Mar 14 → Nov 7 Spring 02:00→03:00, autumn 02:00→01:00
At the same instant, 12:00 UTC on March 13, 2027 is 12:00 in London and 07:00 in New York, five hours apart. On March 14 the two clocks read 12:00 and 08:00, four hours apart. On March 28 they read 13:00 and 08:00, five hours apart. Tokyo reads 21:00 in all three examples.

Compare current time offsets

See Tokyo, London and New York together

Read the date on each city card as well as the clock. To schedule ahead, use the event date and city time zone in your calendar.

Open the three city clocks

Check for skipped and repeated clock readings

New York reading What happens What to check
2027-03-14 02:30 Skipped as 02:00 jumps to 03:00 Choose a valid time and check the invitation
2027-11-07 01:30 Occurs twice UTC−04:00 gives 05:30 UTC, UTC−05:00 gives 06:30 UTC
2027-03-14 01:30 → 03:30 Only 60 elapsed minutes Subtract 06:30 UTC from 07:30 UTC
For elapsed time, see the [time duration guide](/en/blog/time-duration-guide/). Use the [days between dates guide](/en/blog/date-calculation-guide/) to distinguish date intervals from inclusive counts after a date rollover.

Verify a calendar invitation

  1. Add a city to the world clock and compare the date, clock and difference from Tokyo. Current readings depend on the device clock and browser time-zone data.
  2. Set the host city’s time zone on the invitation. For a repeating meeting, decide which city’s local time remains fixed across clock changes.
  3. Verify the attendee’s displayed date and time. For example, write “2027-03-15 22:00 Asia/Tokyo / 09:00 America/New_York on the same date / 13:00 UTC.”

Add a city to the world clock

Check Singapore's time against Tokyo

Choose Singapore and add it to the list. Its clock is one hour behind Tokyo. Check the displayed date too.

Add a city and compare

The utility category groups date, clock and other everyday tools. Favorite the world clock to reopen it in the same browser. Save meeting details in the invitation with the applicable time zone.

Tools Hub editorial staff checked the UK and U.S. rules and the UTC conversions on November 6, 2026.

FAQ

Is Tokyo at 08:00 the previous day in New York?

Yes. Subtract 14 hours in standard time to get 18:00 the previous day, or 13 hours in daylight time to get 19:00 the previous day. Tokyo at 21:00 gives the same date in both cases.

When do the UK and U.S. clocks change in 2027?

London advances on March 28 and goes back on October 31. New York advances on March 14 and goes back on November 7. Use the rule for the specific city and date.

How can 01:30 occur twice in New York?

On November 7, 2027, 01:30 at UTC−04:00 is 05:30 UTC. At UTC−05:00 it is 06:30 UTC. Record the offset or UTC time to distinguish them.

Can I enter a future meeting date in the world clock?

The world clock shows current times. Use a calendar with city time zones for a future meeting. Added cities return to the initial list when you reload.