How can I change the start day of the week

Environment

Product Version	2020.1.114.1
Product	Calendar for Xamarin Forms

Description

This help article will show you how to change the display day of the week in calendar Month view. For example lets change the fist day to be Tuesday.

Solution

This scenario could be achieved using a custom renderer for each platform

Android

create a class inside the Android project, for example MyCalendarRenderer.

using Android.Content;

[assembly: Xamarin.Forms.ExportRenderer(typeof(Telerik.XamarinForms.Input.RadCalendar), typeof(TestProject.Droid.MyCalendarRenderer))]
namespace TestProject.Droid
{
    public class MyCalendarRenderer : Telerik.XamarinForms.InputRenderer.Android.CalendarRenderer
    {
        public MyCalendarRenderer(Context context) : base(context)
        {

        }

        protected override void OnElementChanged(Xamarin.Forms.Platform.Android.ElementChangedEventArgs<Telerik.XamarinForms.Input.RadCalendar> e)
        {
            base.OnElementChanged(e);

            if (this.Control != null)
            {
                Java.Util.Calendar calendar = Java.Util.Calendar.GetInstance(Java.Util.Locale.Uk);
                calendar.FirstDayOfWeek = 3;

                this.Control.Calendar = calendar;
            }
        }
    }
}

For more informatiuon about native Android calendar localization review the Calendar Localization article.

iOS

create a class inside the iOS project, for example MyCalendarRenderer.

[assembly: Xamarin.Forms.ExportRenderer(typeof(Telerik.XamarinForms.Input.RadCalendar), typeof(TestProject.iOS.MyCalendarRenderer))]
namespace TestProject.iOS
{
    public class MyCalendarRenderer : Telerik.XamarinForms.InputRenderer.iOS.CalendarRenderer
    {
        protected override void OnElementChanged(Xamarin.Forms.Platform.iOS.ElementChangedEventArgs<Telerik.XamarinForms.Input.RadCalendar> e)
        {
            base.OnElementChanged(e);

            if (this.Control != null)
            {
                Foundation.NSCalendar calendar = new Foundation.NSCalendar(Foundation.NSCalendarType.Gregorian);
                calendar.FirstWeekDay = 3;

                this.Control.Calendar = calendar;
            }
        }
    }
}

For more informatiuon about native iOS calendar localization review the Calendar Localization article.