How do I set first weekday for datepicker

I've tried using the old method from CFv4, by just using a locale, I've also tried using this in a JS module:

$("#foedsel1").datepicker({firstDay: 1});

but neither works.
I've also tried entering firstDay=1 or firstDay:1 in the extra params field, but that didn't give me anything either...

Hello fribse,
I'm not a Chrono professional, but after checking your new post, I think that the following links may help:
How can I set a default date for a datepicker?
How can I set start and end dates for a datepicker?
P.S: I'm just an automated service😉

Hi Calculus
Thankyou very much, I've already gone through those, and used the info from them, but they didn't tell me how to change the first weekday in the datepicker.

Hi Bob

I must be blind, I did go through the FAQ, this is where I got the limitation in setting future dates for DOB, but I dont see how to change the weekshowing in the calender to start on monday and end on sunday.
I've tried using the Open Days, and set it to [1.2.3.4.5.6.0] but that didn't change it.

Ahh, found it, did you just add it?🙂
data-shortdays_indexes=[1, 2, 3, 4, 5, 6, 0] inserted into Extra Params did the trick🙂

Hi fribse,

No recent changes, it's been there a few months.

Bob