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AtoolinTime Zone Converter
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Time Zone Converter - 時區轉換器

Compare up to 5 time zones side by side. Instant city search, DST-aware conversions, meeting overlap finder, and one-click calendar export.

Search for a city to add a timezone

Try: Tokyo, New York, London, UTC, PST, JST

How Does Time Zone Converter Work?

The converter runs on the browser's native Intl.DateTimeFormat API, which pulls data from the IANA Time Zone Database — the same source used by Linux, macOS, and most programming runtimes. Search a city name and the tool resolves it to an IANA identifier like America/New_York or Asia/Taipei, then applies that zone's current UTC offset with DST factored in. The hour-grid displays up to five zones side by side; clicking any cell shows the matching time across all of them. In our testing, it handles fractional offsets correctly — India's UTC+5:30 and Nepal's UTC+5:45 — which many tools get wrong by rounding to the nearest full hour.

Why Use Time Zone Converter?

Timezone math comes up constantly in remote work: the 12–13 hour gap between Taipei and US stakeholders, checking when Frankfurt and Tokyo markets open relative to your morning, figuring out a live stream slot that doesn't land at midnight for half your audience. This tool handles all of those without mental arithmetic. City search covers over 400 locations including regional aliases like “BJT” (Beijing) and “BKK” (Bangkok). Once you settle on a time, click the calendar export to download an ICS file compatible with Google Calendar, Apple Calendar, and Outlook. In our testing, the export sets the event time correctly in the recipient's local zone — no manual adjustment needed.

When Is the Best Time to Schedule a Meeting Across Time Zones?

For most global teams, 9–11 AM Pacific Time (UTC-8) covers the widest window: London hits 5–7 PM, and Tokyo stays before midnight. Taiwan–US East Coast calls are tighter — 9–10 AM Eastern maps to 10–11 PM Taiwan Standard Time in winter, or 9–10 PM in summer once EDT (UTC-4) kicks in. That one-hour morning slot is usually the only option. The hour-grid in this converter shades each zone's business hours (8 AM–6 PM), so shared windows are visible without doing the math yourself. For a California–India pairing, you typically get one overlap hour per day; the IANA timezone database behind this tool keeps those calculations exact, even across DST transitions.

Frequently Asked Questions

How do I convert time between time zones?
Add a city or UTC offset in the search box, then add more locations as needed. The hour-grid shows all zones side by side. Click any cell in one zone to highlight the corresponding hour across all others. DST is handled automatically based on the date you've selected.
What is the time difference between Taiwan and New York?
Taiwan (UTC+8) is 13 hours ahead of New York during Eastern Standard Time (UTC-5). From mid-March to early November, when New York moves to EDT (UTC-4), the gap drops to 12 hours. The converter adjusts for this based on whichever date you've selected.
Does the time zone converter handle daylight saving time automatically?
Yes. It uses the browser's Intl.DateTimeFormat API against the IANA timezone database, which stores every country's DST rules including historical ones. If your selected date lands near a transition, a yellow badge appears to flag it before you schedule anything.
Can I add a converted time to my calendar?
Yes. Once you've chosen your zones and time, click the calendar export button to download an ICS file. Google Calendar, Apple Calendar, and Outlook all support it. The exported event shows your local start time with the other participants' local times in the description.

All processing happens in your browser. No data is sent to any server.

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