Timezone Converter — Convert Time Between World Timezones

#javascript #webdev #tools #intl

Overview

Timezone Converter converts time between any world timezones using the browser's native Intl API.

🔗 https://devnestio.pages.dev/timezone-converter/

Features

Pick any date/time and source timezone
Add unlimited target zones to the comparison table
Shows UTC offset per zone (accounts for DST automatically)
ISO 8601 UTC output for copy-pasting into code
"Now" button → current local time
Full IANA timezone database via Intl.supportedValuesOf('timeZone')

No library needed

Everything uses native browser APIs:

// Format a UTC Date in a target timezone
const timeFmt = new Intl.DateTimeFormat('en-US', {
  timeZone: tz,
  hour: '2-digit', minute: '2-digit', second: '2-digit', hour12: false
});

// Get offset label e.g. "GMT+9"
const parts = new Intl.DateTimeFormat('en', {
  timeZone: tz, timeZoneName: 'shortOffset', hour: 'numeric'
}).formatToParts(date);