myCalendar jqueryui date returned is not country formatted

Hello,
I have installed myCalendar but I have a problem with the language.
1) I do not know how to set it up in French, so it display in my language
2) This imply that the date selected with the date picker return in some case a wrong date, for example 9/8/2018 (9 of August) create a date 8/9/2018 "8 of September)
How can I setup the language ?
Thank you in advance.
Patrice

You can use Input and Output Filters ([[*createdon:date=`%d-%m-%Y`]]) for the date format.
https://docs.modx.com/revolution/2.x/making-sites-with-modx/customizing-content/input-and-output-filters-(output-modifiers)
https://docs.modx.com/revolution/2.x/making-sites-with-modx/commonly-used-template-tags/date-formats

Hello Erdemozy and thank you for your answer,
I'm new in modex but I'm not sure this is what I need. I will look....but I think it is in the myCalendar code that something has to be set.
Have a nice day
Patrice