Timezone Converter
Convert between timezones
What Is This Tool?
The Timezone Converter takes a date and time in one timezone and shows the equivalent moment in another, using your browser's built-in Intl timezone database so daylight saving rules are handled automatically and correctly.
How to Use
Enter the date and time, and select the source timezone it represents.
Select the target timezone you want to convert into.
Click Convert to see both zones' formatted time and current UTC offset.
Features
- Uses the browser's native Intl timezone database (no library needed)
- Correctly handles daylight saving time transitions
- Covers 20+ major IANA timezones across every region
- Shows the current UTC offset for both the source and target zone
- Copy the conversion result as text
- 100% client-side — nothing leaves your browser
Examples
Input: 3:00 PM in America/New_York
Converted to: Asia/Kolkata → approximately 12:30 AM the next day (India is UTC+5:30, roughly 9.5-10.5 hours ahead of US Eastern depending on daylight saving).
Common Use Cases
- Scheduling a meeting across multiple timezones
- Converting a server log timestamp to your local time
- Coordinating a release or deployment window across regions
- Checking what time it currently is in another part of the world
Frequently Asked Questions
How does this handle daylight saving time?
It uses the browser's built-in Intl.DateTimeFormat with the IANA timezone database, which automatically applies the correct daylight saving rules for the exact date you enter, not just a fixed offset.
Why does the offset shown depend on the date?
A timezone's UTC offset can change across the year due to daylight saving time, so the offset displayed reflects the specific date and time you entered, not a year-round constant.
Does this rely on my computer's local timezone?
No. The source datetime is explicitly interpreted as being in the source timezone you select, entirely independent of your device's own timezone setting.
Why isn't my exact timezone in the list?
The list covers a broad set of major cities/regions covering most common conversions. If your timezone isn't listed, pick the nearest major city that shares the same UTC offset and daylight saving rules.
Is my date/time data sent anywhere?
No. All conversion happens locally in JavaScript in your browser using the Intl API. Nothing is uploaded or logged.
Can the converted date fall on a different day?
Yes, converting across a large offset (for example US to Asia) often shifts the result into the next or previous calendar day, which the formatted output reflects automatically.