How do I work out the best time to call someone abroad?

Do not start from the clock — start from the two windows. Write down the hours each of you is genuinely free, convert one into the other’s local time, and the answer is wherever those two ranges overlap. That is exactly what this page does, and the result is usually narrower than people assume, which is itself useful to know.

Why does the time difference between two cities change during the year?

Because daylight saving starts and ends on different dates in different countries, and plenty of countries do not observe it at all. London and New York are five hours apart for most of the year and four for a couple of weeks in spring, because the two switch on different weekends. This page computes the offset for the date you pick rather than assuming a fixed gap.

What if there is no overlap at all?

It happens — roughly twelve hours apart with ordinary working hours on both sides can leave nothing. The workable answers are usually one of you taking an early morning or a late night on fixed days rather than improvising, or shifting to asynchronous contact during the week and saving live calls for weekends when the free window is much wider.

Does this account for daylight saving?

Yes, automatically. It asks your browser for each zone’s actual offset on the date chosen, using the same time-zone database your operating system keeps updated. It is not a stored table that somebody has to remember to revise.

Is anything I enter here saved?

No. There is no account, no server call and nothing stored — the whole calculation runs in your browser. Closing the tab is the end of it.

Best Time to Call — Time Zone Overlap for Long-Distance Couples

A converter tells you what the clock says somewhere else. That is not the question — the question is when are we both awake and free, which is an overlap between two windows rather than a reading off one clock.

Offsets are computed for the date you pick, so daylight saving is handled properly: two places can be eight hours apart in June and nine in December because they switch on different weekends. Nothing is stored and nothing is sent anywhere — it all runs in your browser.

Date

You

Awake and free fromto

Them

Awake and free fromto

On 2026-09-25, America/New York is on the same clock as America/Toronto. (UTC−04:00 and UTC−04:00)

16h 0m overlap

07:00 – 23:00 your time

07:00 – 23:00 their time

Pick one and make it the standing time. The couples who manage distance well almost all have a fixed slot rather than negotiating it each day.

Looking for somebody, not just a time?

TrueSaath matches worldwide and shows prices and times in your own — so a profile in Toronto and one in Bengaluru are the same search, not two.

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Long-Distance Time Zones — When You Can Both Actually Talk

16h 0m overlap

Looking for somebody, not just a time?

Questions people ask