Time Zone Converter
This free time zone converter turns a time in one zone into the equivalent time in another, for any date, with daylight saving applied for that exact day rather than a fixed offset. Choose any from and to zone, like PST to EST or GMT to IST, and see the result update instantly, with a note if the date shifts.
Pick a date, time, and two timezones.
What does this time zone converter do?
It turns a time in one zone into the equivalent time in another, for whatever date you pick, from ÆON Toolhub. Set a date and time, choose a From and To zone from the full IANA list (not just a handful of popular cities), and the result updates instantly, including a clear note if the conversion lands on the next or previous calendar day.
How do you use it?
Set the date and time. Type them directly, or click "Use current time" to start from right now.
Pick From and To. Both dropdowns list every IANA timezone, so you are not limited to a short menu of major cities.
Read the result. The converted time appears immediately, with the full date and a label if it falls on a different day than the one you entered.
Swap when you need the reverse. The swap button flips From and To in one click, useful when you are checking a conversation both ways.
Does the time difference between two zones ever change?
Yes, and this is the part most converters gloss over. The gap between two zones is not fixed all year if the two places do not start and end daylight saving on the same date.
Take New York and London. Both observe daylight saving, but the United States shifts clocks on the second Sunday of March, while the United Kingdom shifts on the last Sunday of March, roughly three weeks later. For that window, New York is only 4 hours behind London instead of the usual 5. The same kind of gap opens again in autumn, when the two countries revert on different dates.
This tool recalculates the real offset for the exact date you pick, instead of applying one fixed number to a zone all year. Pick a date inside one of those mismatch windows and you will see the difference for yourself.
| Period | New York vs. London |
|---|---|
| Most of the year | 5 hours behind |
| Roughly 3 weeks in March | 4 hours behind |
| Roughly 1 week in late October / November | 4 hours behind |
Why does a fixed-offset converter get this wrong?
Because a fixed offset, like "always UTC-5 for New York," has no way to represent that New York is sometimes on UTC-5 (EST) and sometimes UTC-4 (EDT), and that the switch date is not the same as London's. This tool reads the offset from your browser's real IANA timezone database for the specific date you asked about, not a static lookup table, so it stays correct through the mismatch windows and through any future daylight saving rule change without needing an update.
What this does not do, and why
It does not track a meeting across multiple participants at once. This converts one time between two zones; it is not a group scheduling grid with everyone's working hours overlaid. For a single, precise conversion, especially around a daylight saving boundary, that is exactly the job this tool is built for.
It does not know your device's timezone by default. The From zone starts on a common default rather than guessing your location, so the result is never silently wrong because of a permission you did not grant.
Is this accurate for daylight saving?
Yes. Every conversion reads live from your browser's IANA timezone database, the same data operating systems and most scheduling software rely on, and it is recalculated for the specific date you choose rather than assumed from today's rule.
Frequently asked questions
Does it handle daylight saving time automatically?
Yes, and it recalculates it for the specific date you enter rather than assuming a fixed offset. New York is 5 hours behind London in January and only 4 hours behind for a few weeks each spring, because the two countries start and end daylight saving on different dates.
Why would the time difference between two zones change during the year?
Because not every country starts and ends daylight saving on the same date. The US shifts clocks on the second Sunday of March; the UK shifts on the last Sunday of March. For roughly three weeks in between, New York and London are only 4 hours apart instead of the usual 5.
Can I convert PST to EST, or any other zone pair?
Yes. Pick any two zones from the full IANA list, not just the common US pairs. The tool works the same way for PST to EST, GMT to IST, or a city pair most tools do not bother listing, like Bogotá to Manila.
What does it mean when the result shows "next day"?
It means the converted time falls on a different calendar date than the one you entered, which happens whenever the time difference pushes the clock past midnight. A 9 PM meeting in Los Angeles lands at 1 PM the next day in Tokyo, and the tool labels that explicitly so you never send an invite for the wrong date.
Do all places observe daylight saving time?
No. Most of Asia, most of Africa, and states like Arizona in the US keep the same offset all year, while places that do observe it can start and end on different dates. That is exactly why this tool recalculates the offset for your chosen date instead of using one fixed number per zone.
Is this based on real IANA timezone data?
Yes. It reads directly from your browser's own timezone database, the same Internet Assigned Numbers Authority data operating systems and most software use, rather than a hardcoded table of offsets that goes stale whenever a country changes its daylight saving rules.
Can I convert a time in the past or the future?
Yes. Pick any date, not just today, and the conversion still applies the correct daylight saving rule for that specific date. That matters for scheduling something months out, where the rule in effect on the day you pick may differ from the rule in effect right now.
How is this different from just Googling the time in a city?
Google's built-in widget shows the current time in one place. This tool converts a specific time you choose, on a specific date, between any two zones, and tells you plainly whether the date shifts, which a quick search does not spell out.
Is my data sent anywhere?
No. The conversion runs entirely in JavaScript already loaded in your browser, using the timezone database built into it. Nothing about the date, time, or zones you pick is sent to a server, logged, or stored anywhere, not even in your browser once you leave the page.
Related tools
ProductivityCountdown TimerSet a time, watch it count down, hear a beep at zero.- ProductivityOnline Alarm ClockSet an alarm for any time, right in your browser.
ProductivityAge CalculatorFind your exact age in years, months, and days.- ProductivityWorkday Progress BarSee how much of your workday is done, live, no refresh.
ProductivityFree TeleprompterScroll your script by time, or let it follow your voice as you read.
Rate Time Zone Converter & help shape it
This tool is free and still growing. Tell us what works, what you would change, and what is missing. Your feedback is what decides what we build next.
Last updated: September 20, 2026