Time Zone Converter
Pick a date and time in one time zone and see the same moment in the others, with UTC offsets and daylight saving time taken into account.
| Time zone | Time | Date | UTC offset | Day | Actions |
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About this tool
How a time is converted between zones
A time zone such as Europe/Rome or America/New_York is an entry in the IANA time zone database: a region together with the history of its offsets from UTC, including its daylight saving changes. Converting a time means two steps. First the date and time you typed are turned into one exact moment, using the offset the source zone has on that date. Then that moment is shown with the offset each of the other zones has at that same moment.
This is why the difference between two cities is not a fixed number. New York and London are five hours apart for most of the year, but four hours apart for two or three weeks in March and for one week between late October and early November, because the United States and the United Kingdom change their clocks on different dates.
Skipped and repeated times
When clocks go forward, an hour of local time does not exist. In New York on 8 March 2026 the clock goes from 01:59 straight to 03:00, so 02:30 never happens. When clocks go back, an hour happens twice: on 1 November 2026 the time 01:30 occurs once at UTC-04:00 and again an hour later at UTC-05:00.
The tool tells you when the time you picked falls in one of these windows. A skipped time is moved forward by the length of the gap, and for a repeated time the first occurrence is used; a checkbox lets you switch to the second. JavaScript's Temporal API and Java's java.time apply the same two rules by default.
Reading the table
Each row shows the date and time in that zone, the offset from UTC that applies at that moment, and whether the calendar date there is the same as in the source zone, a day ahead or a day behind. Copy ISO 8601 copies the local time with its offset, for example 2026-11-14T10:00:00+01:00, a form that most languages and databases can parse without knowing the zone. For dates before a region adopted standard time the offset can include seconds, and the copied string then includes them too; ISO 8601 itself only allows hours and minutes in an offset, so a strict parser may reject such a string.
Zones are listed by their IANA names rather than by abbreviations, because abbreviations are not unique: CST is used for Central Standard Time in North America, for China Standard Time and for Cuba Standard Time.
The offsets come from the time zone data that comes with your browser or operating system, read through the Intl API. The rows you choose are remembered in this browser; the date and time you enter are not stored.
Questions
What is the difference between UTC and GMT?
UTC is the time standard that the world's clocks are set from. GMT is the name of the time zone with an offset of zero, which the United Kingdom uses in winter. For converting everyday times the two show the same clock reading.
Why does the offset of a zone change during the year?
Regions that observe daylight saving time move their clocks forward, usually by one hour, in spring and back in autumn. The offset column shows the value that applies on the date you picked, so the same zone can show UTC+01:00 in January and UTC+02:00 in July.
Which time zones are in the list?
The list contains every zone your browser reports from the IANA time zone database, plus UTC. Because the data comes with the browser or the operating system, the list and the rules for recent changes depend on how up to date they are.
Is the date I enter sent to a server?
No. The conversion is done by JavaScript in your browser tab. Only the list of zones you chose is saved, in this browser's local storage, so that it is there on your next visit.