A time zone converter is a free online tool that translates a date and time from one world time zone to another. Pick a source zone, a target zone and a date-time to get a daylight-saving-aware result with GMT offsets, plus a 24-hour meeting planner across New York, London, Tokyo and Sydney, with no signup.
Convert a time
How do you convert time between time zones?
Find the UTC offset of each zone on that specific date, convert the source time to UTC, then add the target offset. For example, 3pm in New York (UTC-4 in summer) is 7pm UTC, which is midnight in Karachi (UTC+5).
The date matters because of daylight saving time: New York is UTC-5 in winter and UTC-4 in summer. This converter computes the offset for your exact date with the Intl API, so DST transitions are handled automatically.
What is the best time for a meeting across the US, Europe and Asia?
Look for the overlap window: late evening in Asia is morning in Europe and very early morning on the US East Coast. A 9am New York call is 2pm in London and 10pm in Tokyo, which usually works for all three.
The planner table above shades night hours (before 8am and after 9pm local) so you can scan for a slot where nobody is asleep. For four or more zones, someone almost always compromises, so rotate the pain fairly.
Why do time zone converters disagree sometimes?
Most disagreements come from daylight saving rules: one tool uses the offset for today's date while another uses a fixed standard offset. Zones also change rules; governments occasionally abolish or shift DST with little notice, so date-specific conversion is the only reliable method.
This tool avoids the first problem by computing offsets for the exact date you enter. For critical travel or broadcast scheduling, still confirm against an authoritative source close to the date.
What is the difference between GMT, UTC and local time?
UTC is the global time standard that never shifts; GMT is effectively the same for everyday use. Local time is UTC plus a zone offset that may change with daylight saving, such as London being GMT in winter and GMT+1 in summer.
When scheduling internationally, always name the zone (for example "3pm New York time") rather than just an offset, because offsets alone hide DST changes.
FAQs
Is this time zone converter free?
Yes. Convert as many times as you like with no account, no watermark and no limits.
Does it handle daylight saving time?
Yes. Offsets are computed with the Intl API for the exact date you enter, so DST transitions in March, October and November are reflected correctly.
How do I schedule a meeting across time zones?
Pick your date and time, then read the meeting planner table: it shows 3-hour slots across New York, London, Tokyo and Sydney with night hours shaded, so you can spot overlap at a glance.
Why did my converted time shift by an hour?
That is almost always daylight saving time starting or ending in one of the two zones. The converter applies the correct offset for the specific date, unlike fixed-offset charts.
Is my data sent anywhere?
No. All conversion happens in your browser using the built-in Intl API; nothing leaves your device.