What time is it tomorrow, somewhere else?
For a chunk of every day, somewhere on earth is already on tomorrow — and if you are messaging them, your “today” and theirs are different dates.
The short answer
Somewhere is always already on tomorrow. The first inhabited places to enter a new day sit at UTC+14 — Kiritimati in Kiribati — and the last are at UTC−11.
That is a spread of 25 hours between the first and last inhabited places on the same calendar date, which is why two dates exist on earth for most of any given day.
Why more than 24 hours of zones exist
If the world used exactly 24 whole-hour zones there would be exactly 24 hours of spread and two dates would coexist for exactly half the time.
In practice the range runs from UTC+14 to UTC−12, a 26-hour span — because several Pacific nations chose offsets beyond +12 so their working week would line up with trading partners rather than with the sun.
Kiribati is the clearest example: it moved its eastern islands across the date line in 1995 so the whole country shared one date. That created UTC+14 and made Kiritimati one of the first places on earth into any new year.
Of inhabited places, the spread is 25 hours — UTC+14 to UTC−11. The full 26 includes uninhabited US minor outlying islands at UTC−12.
Who is on tomorrow, right now
Roughly: anywhere far enough east of you that adding its offset pushes past midnight.
From London, that is most of Asia and Oceania for a large part of the day. From Los Angeles it is almost the entire eastern hemisphere for most of the working day — when it is Monday afternoon in California, it is Tuesday morning in Tokyo, Singapore and Sydney.
Where this actually bites
Birthday and anniversary messages, which arrive on the wrong date and read as forgetting. This has its own scenario.
Deadlines given as a date with no time. "By Friday" is up to a day of ambiguity across a wide gap — and considerably worse if one party's weekend starts on a different day, as in much of the Middle East.
"Tomorrow" and "yesterday" in conversation. These are relative to whoever is speaking, and across a wide gap they can refer to the same calendar day. Say the date.
Anything with a daily cutoff — trading, reporting, billing periods. Which date a transaction lands on depends entirely on which zone the cutoff is defined in, and it should always be stated.
The habit
For anything where the date matters, write the date and a place:
"Due Friday 14 March, 17:00 New York."
Not "by Friday." Not "EOD tomorrow." Both of those are a day wide across the Pacific, and about ten hours wide across the Atlantic.
Related: The international date line · What time is it in another country?
Timezone: World Clock Widget
A world clock, converter and live day/night map for iPhone — 325 cities, offline, no account.
Figures on this page are computed from the IANA time zone database. Last generated 2026-08-18.