Time Zone Converter
Free online Time Zone Converter. Convert date and time between any world time zones (IST, EST, PST, GMT, CET, JST) using browser-native IANA timezone databases. Accurately handles Daylight Saving Time (DST) transitions and fractional hour offsets. 100% private, fast, and runs locally in your browser.
Your files never leave your device. All processing happens on your device. No uploads, ever.
How to use Time Zone Converter
- 1
Select Source Time Zone
Choose origin city or timezone (e.g. Asia/Kolkata IST).
- 2
Select Destination Time Zone
Choose target city or timezone (e.g. America/New_York EST).
- 3
Pick Date & Time
Enter date and time to see instant converted local time and UTC offset.
Native IANA Timezone Database & DST Accuracy
Our engine uses the browser's built-in `Intl.DateTimeFormat` API and official IANA timezone identifiers (e.g. Asia/Kolkata, America/New_York). Daylight Saving Time changes and fractional hour offsets (like +5:30 or +5:45) are automatically respected.
Instant World City Lookup
Convert time across major global business hubs including London, New York, Tokyo, Sydney, Dubai, Singapore, and Mumbai in real time.
Frequently asked questions
How does the converter account for Daylight Saving Time (DST)?
By using native IANA timezone strings, the browser automatically applies historical and active DST rules for the specific date selected.
Does it support fractional time zones like India (+5:30) or Nepal (+5:45)?
Yes! All non-integer UTC offsets are fully supported with exact minute precision.
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Last updated 10 August 2026