Time Zone Converter
Convert a date and time from one time zone to another using IANA zone names. DST is handled automatically by your browser.
From
To
Conversion uses IANA timezone data built into your browser. DST transitions are handled automatically.
How to convert between time zones
- Enter the date and time you want to convert.
- Select the source time zone (From).
- Select the destination time zone (To).
- Click Convert Time to see the result in both 12-hour and 24-hour formats.
How it handles daylight saving time
DST transitions are handled automatically by the browser's built-in Intl API, which uses the IANA timezone database. Zone offsets like "UTC−5/−4" reflect the winter and summer offsets respectively — the correct one is applied based on the date you enter.
Privacy — runs in your browser
Conversion uses the JavaScript Intl.DateTimeFormat API with IANA timezone data your browser already has. No date or time data is sent to any server. No signup required.
Frequently Asked Questions
Does this support all IANA time zones?
The list above covers the most commonly used zones. The underlying Intl API supports all IANA zones available in your browser, which in modern browsers covers the full IANA database.
Why does the date sometimes change?
When converting across the international date line or large UTC offsets, the local date can shift forward or backward by one day. The converted date is shown alongside the time.
Is DST applied automatically?
Yes — the browser's IANA timezone data knows when DST starts and ends for each zone each year, so you always get the correct offset for the specific date you entered.