Time zone conversions that get daylight saving right
Most converters give you one number and hope you are asking in the right month. Every page here shows the standard-time answer, the daylight-saving answer, and which one applies today.
Convert a time
LiveYour device reports your local zone. Everything is calculated in your browser.
Live clocks in the cities people ask about most
Each clock runs in your browser and follows that city's daylight saving rules automatically.
The conversions people search for most
Working hours between the US, Europe and Asia — each with its own page, a full-day table and the seasonal caveat spelled out.
Zone to zone
A specific meeting time
Guides that explain the mess
Why IST means three different things, why your recurring meeting drifts twice a year, and how to store time in software without creating bugs.
Daylight saving explained
Which countries change their clocks, when they do it, and why the same two cities can be five hours apart one week and six the next.
UTC, GMT and Zulu time
What UTC actually is, how it differs from GMT, why aviation says Zulu, and when the distinction matters.
Scheduling across time zones
A practical method for booking meetings across zones: finding the overlap, rotating the pain, and stopping recurring calls from drifting.
Why abbreviations are ambiguous
IST means three different things, CST means three more. Which abbreviations are ambiguous and what to use instead.
The International Date Line
Why crossing one line changes the date, how a flight can arrive before it left, and which places are furthest apart in time.
Remote work across zones
How distributed teams actually handle time differences: core hours, async defaults, handovers and the failure modes to avoid.
Built on the same data your operating system uses
Both answers, always
Where a pair does not keep a constant gap, we publish the standard-time result and the daylight-saving result side by side rather than one figure that is wrong half the year.
IANA data
Offsets come from the same database your operating system uses, so a government rule change flows through instead of sitting stale in a hard-coded table.
Nothing leaves your browser
Clocks and conversions run locally. No location permission, no logging of what you entered, no tracking scripts before you consent.
Time zones, explained properly
How to write a meeting invite that survives every time zone
A meeting invite that says "Tuesday 3pm" is a coin toss the moment it crosses a border. Five fixes, none of which take more than a minute.
Why your recurring meeting moves by an hour twice a year
The US changes its clocks three weeks before the EU. For those three weeks, every standing transatlantic meeting is in the wrong slot — and almost nobody notices until someone misses it.
Working with a US team from Europe: a practical timetable
Europe gets the mornings to itself and the Americans arrive after lunch. Structure the day around that and it works; fight it and you finish at 9pm.
Common questions
Usually because one of them ignores daylight saving. The gap between many zone pairs is not constant — it changes when one side puts its clocks forward and the other does not. Every pair page here states both the standard-time and the daylight-saving answer.
All three use the abbreviation. On this site IST means India Standard Time, UTC+5:30, because that accounts for the overwhelming majority of searches. Each zone page names the IANA identifier so there is no ambiguity.
The IANA time zone database, which is the same source your operating system, your phone and your programming language use. Nothing here is a hard-coded offset table, so rule changes flow through automatically.
No. Every clock and conversion runs inside your browser using its own time zone data. Nothing you type is sent to our servers, and we never ask for location access.
Stop guessing which hour applies
Bookmark the pair you use most, or plan a whole team's overlap in one grid.