Scheduling a call between Karachi and New York, catching a flight that lands “tomorrow” in Tokyo, or joining a webinar listed in yet another timezone — getting the time wrong is embarrassingly easy. Timezone math is genuinely tricky: offsets shift with daylight saving, and half-hour zones like India break naive calculations.
Our free timezone converter removes the guesswork. Enter a date and time, tell it which timezone that time is in, and instantly see the equivalent local time in 20+ major cities worldwide — from Auckland to Honolulu — using your browser’s built-in Intl timezone database, which handles daylight saving automatically.
No sign-up, no app, no stale conversion tables: the results are computed live from the same timezone data your operating system uses.
How to use the timezone converter
- Enter the date and time. The moment you want to convert — a meeting time, flight departure, event start.
- Select its timezone. Tell the tool which zone the entered time belongs to (your source is highlighted in the results).
- Read the converted times. Every listed city shows the same moment in its local time, with weekday and date.
- Change the source freely. Switch the “from” zone to convert the other direction — results update instantly.
- Check DST automatically. Daylight saving is handled by the Intl API, so March and November conversions stay correct.
- Plan around it. Find overlap hours that work for everyone before sending the invite.
Key features & benefits
- 20+ world timezones. From Pacific/Auckland to Pacific/Honolulu, covering the cities people actually schedule across.
- Automatic daylight saving. Uses the browser’s Intl timezone database — no manual DST tables to maintain.
- Any-direction conversion. Set any zone as the source; all others convert instantly.
- Weekday + date shown. Catches the classic “wait, that’s Tuesday for them?” surprise.
- Source highlighting. Your input zone is marked in the results so you never lose track.
- Private and free. No account, no tracking; conversions happen on your device.
- Always current. Timezone rules come from your OS/browser data, not a hardcoded table that goes stale.
Why timezone conversion is harder than it looks
Offsets are not fixed: New York is UTC−5 in winter but UTC−4 in summer, and governments occasionally change DST rules with little notice. Half-hour (India, Adelaide) and 45-minute (Kathmandu) offsets break “just add hours” math, and the International Date Line means a meeting can be “tomorrow” for one side. Doing the conversion against live tzdata — as this tool does — sidesteps all of it.
Scheduling across zones
The golden rule: propose times in UTC or name the zone explicitly (“3pm PKT”), and always confirm the weekday on the other side. For countdowns to the converted moment, pair this with the countdown timer; to measure gaps between two moments, use the date duration calculator.
Timing the call itself? Use the stopwatch to keep meetings on track, or block focus time around it with the Pomodoro timer.
Frequently asked questions
How do I convert time between two timezones?
Enter the time, select the timezone it is in, and read the target city’s row — the tool shows the identical moment expressed in that city’s local time. To go the other way, just change the source timezone; every row updates instantly.
Does it handle daylight saving time?
Yes. Conversions use your browser’s Intl API with full IANA timezone data, which encodes each zone’s DST rules for the specific date you enter. A July conversion and a January conversion for the same cities will correctly show different offsets where DST applies.
What timezones are included?
Twenty-two zones covering the globe: UTC, Auckland, Sydney, Tokyo, Seoul, Singapore, Dhaka, Kolkata, Karachi, Dubai, Cairo, Moscow, Berlin, Paris, London, São Paulo, New York, Toronto, Chicago, Denver, Los Angeles and Honolulu — the cities most scheduling actually involves.
Why does the date change for some cities?
Because the world spans 26 hours of local time from UTC−12 to UTC+14. An evening meeting in Karachi is the same calendar day’s morning in New York but already the next day in Sydney. The converter shows weekday and date for every city precisely so these day-boundary surprises are visible.
Can I use this for flight times?
Yes — enter the departure time in the departure city’s zone to see what time it is elsewhere at that moment, or the arrival time in the arrival zone to compare. Remember airlines list local times at each end, and this tool converts the instant, not the flight duration.
Is the converter free?
Completely free with no sign-up. All conversions run locally in your browser using its built-in timezone data.
How It Works: Under the Hood
Every conversion is arithmetic on UTC: local time = UTC + offset. The complexity is that offsets aren’t fixed — daylight saving time shifts them by an hour on region-specific dates (US: second Sunday of March to first Sunday of November; EU: last Sundays of March/October; many countries: never). The IANA timezone database tracks every region’s complete offset history and future rules — “Asia/Karachi” (UTC+5, no DST) vs “America/New_York” (UTC−5/−4). Correct conversion parses your input in the source zone, converts to UTC, then renders in the target zone. The edge cases that break naive converters: the missing hour (2:00–3:00 AM doesn’t exist on spring-forward day) and the repeated hour (1:00–2:00 AM happens twice on fall-back day).
Real-World Use Cases
- Global team meetings: a manager in Karachi scheduling standup for developers in Berlin and a designer in Toronto — find the overlap window where nobody suffers.
- Flight itineraries: departing 11 PM New York, arriving 1 PM Tokyo “next day” — convert both to UTC to get the true 14-hour duration and landing date.
- Webinar launches: “3 PM EST” means midnight for Karachi attendees — convert and publish all major zones, or half your audience no-shows.
- Market hours: forex and crypto traders tracking London/New York session overlaps in local time.
- Remote freelancers: quoting deadlines as “Friday 5 PM PKT” and converting for the client’s zone to avoid missed-delivery disputes.
Advanced Tips
- State times in UTC in writing. “Meeting at 14:00 UTC” is unambiguous forever; “3 PM” without a zone is a bug waiting to happen.
- Watch DST transition weeks. A recurring meeting shifts by an hour for US or EU participants twice a year — reconfirm the week of the change, don’t assume.
- Check the date, not just the time. 9 AM Monday in New York is 6 PM Monday in Karachi — but 9 PM New York is 6 AM Tuesday in Karachi. Date flips cause more misses than hour errors.
- Use IANA names, not abbreviations. “EST” vs “EDT”, “IST” (India? Israel? Ireland?) — abbreviations are ambiguous; Asia/Karachi never is.
Common Mistakes to Avoid
- Forgetting DST exists. Scheduling “the same time every week” across zones breaks twice yearly — the offset you memorized in January is wrong in July.
- Assuming offsets are constant. Some zones changed offsets permanently (Samoa skipped a whole day in 2011) — always convert, never memorize.
- AM/PM confusion in 12-hour times. “12 AM” vs “12 PM” trips up even natives — use 24-hour format for anything that matters.
- Missing the International Date Line. Sydney to Los Angeles “arrives before it departs” by the clock — duration math must go through UTC.
The DST Trap: Scheduling Across March and November
Twice a year, timezone math quietly breaks. When the US springs forward but Europe hasn’t yet, the New York–London gap shrinks to four hours for three weeks; in autumn it stretches to five. Recurring meetings set in “3pm ET” suddenly land wrong for half your attendees. This converter handles daylight saving automatically through your browser’s timezone database, so conversions stay correct through every transition. Always re-check recurring meetings after a DST change — or schedule in UTC and let the countdown timer remind you when it’s time.
Finding Meeting Overlap Across Continents
The hardest part of global scheduling isn’t conversion — it’s finding hours that work for everyone. Convert your 9-to-5 into each colleague’s local time and look for the overlap window; for US–Europe–Asia teams it’s often a narrow one-to-two-hour slot. Rotate the pain of odd hours instead of making one region always take the midnight call. Once you’ve found the slot, measure the gap to it with the date duration calculator when planning weeks ahead.
Frequently Asked Questions
Does it handle half-hour zones like India?
Yes. The converter uses your browser’s built-in timezone database, which includes half-hour and 45-minute offsets like India (UTC+5:30) and Nepal (UTC+5:45).
Can I compare more than two cities at once?
Yes — enter one time and the tool shows it converted across 20+ major cities simultaneously, so you can scan the whole team at a glance.
Do I need to know the UTC offset?
No. Just pick the city or region from the list — offsets and daylight-saving rules are applied automatically.