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Time Zone Converter

Convert date and time between time zones using the Intl API. View multiple zones simultaneously, see UTC offsets, and format in 24h/12h/ISO. Runs entirely in your browser — your data never leaves your machine.

timezone time date converter utc intl

Published May 29, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Enter a date/time and select source and target time zones to convert between them. The tool uses the browser’s Intl.DateTimeFormat API for accurate timezone handling including daylight saving time transitions. Switch to Multi-Zone mode to see the same moment across multiple time zones simultaneously.

Features

  • Timezone conversion: convert between any two IANA time zones
  • Multi-zone view: see the same moment in 4+ zones at once
  • 35 preset zones: grouped by Americas, Europe, Asia/Pacific, Africa/Middle East
  • Multiple formats: 24-hour, 12-hour (AM/PM), ISO 8601, date
  • UTC offset display: shows current offset for each zone
  • DST-aware: handles daylight saving time transitions correctly
  • Add/remove zones: customize the multi-zone display
  • 5 conversion examples: popular city-to-city conversions
  • Private: runs entirely in the browser — no data transmitted

Use Cases

  • Scheduling meetings across time zones
  • Converting timestamps from server logs to local time
  • Checking what time it is in another city
  • Planning international travel or calls
  • Debugging timezone-related issues in applications