https://www.telerik.com/forums/griddatetimecolumn-how-to-set-de-firstdayofweek
GridDateTimeColumn : how to set de FirstDayOfWeek in UI for ASP.NET AJAX | Telerik Forums
https://pub.dev/documentation/syncfusion_flutter_datepicker/latest/datepicker/DateRangePickerMonthViewSettings/firstDayOfWeek.html
firstDayOfWeek property - DateRangePickerMonthViewSettings class - datepicker library - Dart API
API docs for the firstDayOfWeek property from the DateRangePickerMonthViewSettings class, for the Dart programming language.
firstdayofweekpropertyclassdatepickerlibrary
https://pub.dev/documentation/persian_calendar_widget/latest/core_data_enums_first_day_of_week/FirstDayOfWeek.html
FirstDayOfWeek enum - first_day_of_week library - Dart API
API docs for the FirstDayOfWeek enum from the first_day_of_week library, for the Dart programming language.
first day of weekfirstdayofweekenumlibrarydart