Timezone Conversion in JavaScript: Why getTimezoneOffset() Will Betray You

📰 Dev.to · HAU

Learn why getTimezoneOffset() is unreliable for timezone conversion in JavaScript and how to do it correctly

intermediate Published 29 Mar 2026
Action Steps
  1. Use the Intl.DateTimeFormat API to get the timezone offset
  2. Configure the timezone using the IANA timezone format
  3. Test the conversion with different timezones and dates
  4. Apply the timezone conversion to your application's date and time handling
  5. Compare the results with getTimezoneOffset() to see the differences
Who Needs to Know This

Backend developers and full-stack engineers working with date and time data in JavaScript will benefit from understanding the limitations of getTimezoneOffset() and learning alternative methods for accurate timezone conversion.

Key Insight

💡 getTimezoneOffset() is not a reliable method for converting between timezones in JavaScript due to its limitations and potential for errors

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🕰️ Don't rely on getTimezoneOffset() for timezone conversion in JavaScript! Learn why and how to do it correctly 👉

Full Article

Ask any JavaScript developer how to convert between timezones and someone will say: "use...
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