Time Zone Converter
Convert any date and time between two time zones, with current UTC offset and daylight-saving handling.
Converted time
From
How time zone conversion works
Every time zone has an offset from Coordinated Universal Time (UTC). To convert between zones, we compute the moment in UTC, then re-format it for the target zone — using the IANA time zone database and the browser's Intl.DateTimeFormat API for accurate daylight-saving handling.
DST transitions matter: New York is UTC−5 in winter and UTC−4 in summer; some places (Arizona, India) don't observe DST at all. Your browser handles all 600+ IANA zones — we expose ~80 popular ones in the dropdowns above. To request a zone we don't list, email us.
Common conversion examples we'll soon expand into a comparison grid: New York → London, San Francisco → Tokyo, London → Sydney, Singapore → São Paulo.
Show the math
Frequently asked questions
How does the time zone converter handle daylight saving time (DST)?
The tool uses the browser's IANA time zone database via Intl.DateTimeFormat with timeZoneName: 'shortOffset'. Each conversion computes the actual UTC offset for that specific date — so March 14 in New York is UTC−5 but March 15 (after DST starts) is UTC−4, automatically.
What's the difference between EST and EDT?
EST (Eastern Standard Time, UTC−5) is winter time in places like New York. EDT (Eastern Daylight Time, UTC−4) is summer time. Most of the US uses EST/EDT — a few places (Arizona, Hawaii) don’t observe DST. This converter handles both seasons automatically based on the date you enter.
Can I use IANA time zone names like Asia/Kolkata?
The dropdown lists ~80 popular zones. For an exotic zone we don't list, email us. Internally the tool always uses IANA names (the modern standard) — the friendly labels are just for display.
Why does my "now" time look slightly off?
The "Use current time" button reads your system clock and formats it for the From zone. If your computer's clock is wrong, the result will be wrong. Sync your OS time settings to fix.