Make the week start on Sunday instead of Monday in Angular @worktile/gantt (ngx-gantt)

I need to make the Gantt to start on Sunday instead of Monday - we are using Angular @worktile/gantt (ngx-gantt) - Right now the Gantt's UI shows that the week starts on Monday.

This is what I tried and didn't work:

viewOptions: any = {
dateFormat: {
yearMonth: 'MM/y',
yearQuarter: 'y',
year: 'y',
week: 'w',
month: 'MM',
},
dateOptions: {
weekStartsOn: 6,
},
};


<ngx-gantt
#gantt
[groups]="groups"
[items]="items"
[viewOptions]="viewOptions"
[loading]="isLoading"
[draggable]="true"
[viewType]="ganttDateMap[dateView]"
(barClick)="onBarClick($event)"
(dragEnded)="onBarDragEnded($event)"
>

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