Change language and default first day of the week in calendar element (Jira Cloud)?

[Daniel Alomar Claramonte]

We have Jira Cloud. Language setting set to Spanish in the settings and the browser language set to Catalan (also test it set to Spanish). The date element shows me Sunday as the first day of week and the calendar in English, The global configuration has Monday as the first day of the week (team calendar). 

[Humashankar VJ]

Hi @Daniel Alomar Claramonte 

Directly changing the first day of the week in the calendar element based on user preferences is not possible.

You can try other options.

Existing feature request is already out there - How to set Monday as first day of week in Date Picker calendar | Jira | Atlassian Documentation

Hope this helps - Happy to help further!!
Thank you very much and have a great one!
Warm regards