Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

toLocaleString outputs different in FF Developer

  • 2 replies
  • 2 have this problem
  • 26 views
  • Last reply by Brahma Dev

Brahma Dev
Brahma Dev
more options

new Date(1743623960000).toLocaleString(['en-ES'])

outputs "4/2/2025, 7:59:20 PM" in normal firefox and "2/4/2025, 7:59:20 PM" in Firefox Developer. Test on MacOS and Ubuntu.

new Date(1743623960000).toLocaleString(['en-ES']) outputs "4/2/2025, 7:59:20 PM" in normal firefox and "2/4/2025, 7:59:20 PM" in Firefox Developer. Test on MacOS and Ubuntu.

Modified by Brahma Dev

All Replies (2)

TyDraniu
TyDraniu
  • Top 10 Contributor
more options

I don't think we understand 'en-ES'. It should be 'en-US' or 'es-ES'.

Brahma Dev
Brahma Dev Question owner
more options

Thanks. Is there some web page where such different behaviours between Firefox Developer and Firefox is maintained ?