Calendar language problem since 2021

[Sylv1]

Hi Community ! 

I have created an app for a client, using Calendar.Weekdaylong as a week gallery. (from Sunday to Saturday)
And  "Upper(Text(_firstDayOfWeek; "[$-fr-FR]mmmm yyyy"))" as current Month and Year 

Everything was fine, until 2021...   Even all the settings are in French (cf list), now the weekdays and Month names  are in English instead of French. (for all users). 
When i open PowerApps Studio or F5, Language() is "fr-FR" and when i Launch the Application (from URL or Application list ) Language is "en-US". 

Have you an idea to get back to french Days and Months names ? Is that a MS anomaly on the tenant ? 

Thank you 

Settings are all French for 

Computer / Windows 10
Chrome / Edge  
Delve User profile Language 
Prefered Language in User Profile 
Profile Regional Settings 

SharePoint Settings 

[NHGA]

Hi,

General problem at the moment that everyone outside of US/America date & number formatting experiences. I have seen questions from France, Poland, Denmark, Sweden etc...

I have my related question here:

https://powerusers.microsoft.com/t5/Building-Power-Apps/Date-and-Number-Format-suddenly-US-American-...

I have also submitted this as a ticket to Microsoft and spoken with their first line support.

I will update my question once I know more, but hopefully this is something Microsoft will roll-back/fix in the background.

[RandyHayes]

@Sylv1 

Please consider changing your Formula to the following:

    Upper(Text(_firstDayOfWeek; "[$-fr-FR]mmmm yyyy", "fr"))

This will show your date with the proper locale.

I hope this is helpful for you.

[Sylv1 · Accepted solution]

Thanks @RandyHayes 

That works fine for the month.
Considering the common problems refered by @NHGA  i will probably opt for my own Week Days Collection instead of  Calendar.Weekdaylong 

Thank you very much