🔄Time zone converter

✓ Tested & verified Updated: Aug 11, 2026 How this works

Time zone converter

Time From To

That time, there

—

Worked out for today, because the gap between two zones is not a constant.

Other clock format—
Day—
From—
To—

Try also

How do you convert a time between zones?

The TimerPlan converter takes the time you give, removes the source zone’s offset to reach UTC, applies the target zone’s offset, and reports both the resulting time and whether it lands on another day. Both offsets are computed for today rather than looked up, which is the only way to get the weeks around a clock change right.

Those weeks are exactly when converting by hand goes wrong. The United States and Europe move their clocks on different dates, so the New York to London gap is five hours most of the year and four for about three weeks each spring.

The day marker matters as much as the time. A nine o’clock call in San Francisco is five in the afternoon in London the same day, but a five o’clock call is one in the morning tomorrow — and the time alone does not tell you that.

Gaps that change during the year, which is most of the useful ones:

Pair	Usual	For a few weeks
New York → London	+5 h	+4 h in March, +6 h in early November
Los Angeles → Berlin	+9 h	+8 h in March
London → Sydney	+9 h	+11 h in the southern summer
New York → Delhi	+9:30 h	+10:30 h in winter
Anywhere → Arizona	fixed	Arizona never moves; everyone else does

The southern hemisphere row is the one that surprises people: Australia’s clocks go forward when Europe’s go back, so the gap moves by two hours rather than one.

To watch several places at once rather than convert one time, use the world clock. To find the hours that work for everybody, the world meeting planner in time plans intersects working hours across a list of zones. For arithmetic within one zone — adding a length, or the gap between two times — use the time calculator and the time duration calculator.

Frequently asked questions

Why not just add the difference I remember?

Because the difference you remember is right for most of the year and wrong for the rest. Beyond the clock-change weeks, several countries have changed their rules recently and a few have abolished daylight saving altogether. Computing the two offsets for the date in question costs nothing and removes the whole class of error.

What does the day marker mean for a meeting invitation?

That you should say the date as well as the time, and say it in both places. Half of all cross-zone meeting mistakes are a correct time on the wrong day, and calendar software only saves you when everyone’s calendar has the right zone set — which, for a person who travels, is often not the case.

Can I convert a time in the past or future?

This page converts for today, which covers the overwhelming majority of use. For a date months away the correct answer depends on whether daylight saving is in force on that date in both places, and that flips at different times in each hemisphere — so an autumn meeting arranged in summer can shift by an hour. Where the date matters, set it in a calendar and let it hold the zones.

What is UTC, and is it the same as GMT?

UTC is the modern standard, defined by atomic clocks and kept within a second of the earth’s rotation; GMT is a time zone that happens to equal UTC in winter and shifts to UTC+1 in British summer. Every zone here is expressed as an offset from UTC, and that is what makes the arithmetic reliable — UTC has no daylight saving and never will.

How this works

The time you enter is parsed into minutes past midnight. The source zone’s current offset from UTC is computed by formatting the present instant in that zone and comparing it with UTC; the same is done for the target. Subtracting the first and adding the second converts the time, and dividing the result by a day gives the day difference — previous, same or next — which is reported alongside rather than left for you to notice. Because both offsets are derived from the browser’s IANA zone database at the moment of the calculation, daylight saving, half-hour zones and recent rule changes are all included without a table to maintain. The result is shown in both 12-hour and 24-hour form, since a converted time is usually being sent to someone who reads the other one.

Worked example

With Time 9:00 am, From UTC Los Angeles Denver Chicago New York Sao Paulo London Berlin Paris Madrid Warsaw Athens Moscow Lagos Johannesburg Dubai Karachi Kolkata Bangkok Shanghai Singapore Tokyo Seoul Perth Sydney Auckland New York, To UTC Los Angeles Denver Chicago New York Sao Paulo London Berlin Paris Madrid Warsaw Athens Moscow Lagos Johannesburg Dubai Karachi Kolkata Bangkok Shanghai Singapore Tokyo Seoul Perth Sydney Auckland London, this page works out —. Worked out for today, because the gap between two zones is not a constant.

Sources:

The three parts of a correct answer

The time. In whichever clock format the reader uses — both are shown.

The day. Same, next or previous. Missing this is the classic mistake.

Today’s offset. Not the offset from memory, and not last year’s rule.