Converting a time between time zones
Pick a date, a wall-clock time and where that time lives, and this converter shows the same moment anywhere else on Earth — the exact local time, the calendar day it lands on, both UTC offsets, and the net difference in hours. It also shows the moment in eight major cities at once, which is usually the real question behind a conversion. The math goes through UTC, the world's reference time, and uses the full international time-zone database built into your browser, so daylight saving changes on the exact right dates for each city.
How the conversion works
There is no single fixed offset per city: New York is UTC−4 in October (daylight time) and UTC−5 in January (standard time), and London changes on different weekends than New York, so for a few weeks a year the gap between them is four or six hours instead of the usual five. Because the conversion always looks up the offset that applies on your chosen date in each zone, those awkward weeks are handled correctly — a fixed "EST is UTC−5" table would get them wrong.
The international date line effect
Convert far enough east or west and the answer falls on a different calendar day: noon in New York is 1 a.m. the next day in Tokyo and 3 a.m. the next day in Sydney. The day-shift is shown next to every city in the table, because "Tuesday 1 a.m." is a very different plan from "Monday 1 a.m.". For scheduling a call across several cities at once, the Meeting Planner rates each city's local time against working hours.
Worked example
12:00 noon in New York on October 12, 2026 is 17:00 in London the same day — a 5-hour difference, because both cities are still on daylight time then.
How to use this calculator
- Enter the date and the time you want to convert.
- Choose the time zone that time belongs to.
- Choose the zone to convert into and read the converted time in the green panel.
- Scan the city table for the same moment around the world, day shifts included.
Why zones have half hours and 45 minutes
Not every offset is a whole hour: India is UTC+5:30, Nepal is UTC+5:45, and parts of Australia use half-hour offsets. These came from local solar time being rounded when zones were standardised. This converter handles them exactly, which matters — a whole-hour approximation puts a Mumbai call 30 minutes wrong.