London to New York
5:00 AM. Friday in New York.
9:00 AM GMT in London is 5:00 AM in New York the same day. New York is 4 h behind.
Every sky you love, side by side.
Sol for iPhone is coming soon, with your places side by side under their own skies, each on its own clock.
London
9:00 AM
Friday 30 October
GMT · UTC
New York
5:00 AM
Friday 30 October
EDT · UTC−4
Both at work from 1:00 PM to 5:00 PM in London, 9:00 AM to 1:00 PM in New York, taking nine to five in each.
The difference through 2026.
How it knows.
The browser’s own tables
Every time here is read from the zone tables your browser carries, the IANA database by its zone id (America/Los_Angeles, not “Pacific”), never from an offset typed by hand. A zone’s name is what the tables say for the moment asked: PDT in a Pacific summer, PST in its winter.
Hours the clocks change
A clock change removes an hour in spring and repeats one in autumn. Both are reported rather than moved: an hour that does not exist is named, with the time the clock reads instead, and an hour that happens twice is given both ways.
The light beside the clock
An hour alone says nothing about the sky, so each clock stands beside its day’s light, worked out for the city from the sun’s position. The pages are rebuilt every night, and every time is worked out again in your browser when the page opens.
The other way, and other clocks.
New York → Londonthe same pair, reversed Melbournethe clock and the light New Yorkthe clock and the lightEvery place, its own light.
Sol for iPhone is coming soon, with your places side by side under their own skies, each on its own clock. Leave your address for early access and one email when it ships.
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