Sun Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat Sun

I have purchased a Theme in wp that is using https://fullcalendar.io/

Current Week Structure is → Sun Mon Tue Wed Thu Fri Sat , but I want it to be like → Mon Tue Wed Thu Fri Sat Sun

This is the theme Demo from where I have purchased Click Here →

The theme owner aid contact to https://fullcalendar.io/ , but on their website I find that I have to seek StackOverflow for the support.

You probably have to make a change to the javascript of the theme to accomplish this. Check out the file events.js in the js directory of your theme. Starting on line 48 try replacing this code:

jQuery('#event-calender-widget').fullCalendar({
    aspectRatio:1,
    events: calenderAjax.events,

With:

jQuery('#event-calender-widget').fullCalendar({
    aspectRatio:1,
    firstDay:1,
    events: calenderAjax.events,

Good luck!