Hi folks,

I stumbled upon some inconsistencies in date formatting when using react-intl and other date libraries. In particular, I use date-fns to provide I18N support for MUI date pickers.

I get different results for september in es and de locales when using it like:

const formattedDate = myIntl.formatDate(start, {
  month: 'short',
  year: 'numeric',
  timeZone: 'UTC',
});

This results in Sept. but Sep. in date-fns.

What is right and what's the best way to fix that? At least, I could find this spec: https://www.localeplanet.com/icu/de/index.html and that led me here to ask.

All the best!