public override bool TrySetViewMode(CalendarViewMode view, bool isAnimated)
        {
            if (view == CalendarViewMode.Day)
            {
                Control.DayView.DayEventsViewStyle.TimeLabelFormat.TimeZone = Java.Util.TimeZone.GetTimeZone("add time zone here");
            }

            return base.TrySetViewMode(view, isAnimated);
        }

 public class AppointmentViewModel : Telerik.XamarinForms.Input.Appointment
    {
        public Int32 PK { get; set; } = -1;
        public String DisplayStartTime
        {
            get
            {
                return StartDate.ToString("HH:mm");
            }
        }
        public String DisplayEndTime
        {
            get
            {
                return EndDate.ToString("HH:mm");
            }
        }
        public double AppointmentDate
        {
            get
            {
                return StartDate.Date.ToOADate();
            }
        }

        public string AppointmentDisplayDate
        {
            get
            {
                return StartDate.Date.ToString("ddd dd MMM");
            }
        }
    }

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:telerikPrimitives="clr-namespace:Telerik.XamarinForms.Primitives;assembly=Telerik.XamarinForms.Primitives"
             xmlns:zxing="clr-namespace:ZXing.Net.Mobile.Forms;assembly=ZXing.Net.Mobile.Forms"
             xmlns:telerikInput="clr-namespace:Telerik.XamarinForms.Input;assembly=Telerik.XamarinForms.Input"
             xmlns:telerikGrid="clr-namespace:Telerik.XamarinForms.DataGrid;assembly=Telerik.XamarinForms.DataGrid"
             xmlns:helper="clr-namespace:ProductManager.Helper_Code"
             xmlns:telerikDataControls="clr-namespace:Telerik.XamarinForms.DataControls;assembly=Telerik.XamarinForms.DataControls"
             xmlns:telerikListView="clr-namespace:Telerik.XamarinForms.DataControls.ListView;assembly=Telerik.XamarinForms.DataControls"
             x:Class="ProductManager.Pages.pgAppointments" Appearing="ContentPage_Appearing" Disappearing="ContentPage_Disappearing" >
    <ContentPage.Content>
		<Gride HorizontalOptions="Fill" VerticalOptions="Fill" Margin="0,0">
			<Grid.ColumnDefinitions>
				<ColumnDefinition Width="*"/>
			</Grid.ColumnDefinitions>
			<Grid.RowDefinitions>
				<RowDefinition Height="*" />
				<RowDefinition Height="Auto" />
			</Grid.RowDefinitions>
			
			 <telerikInput:RadCalendar x:Name="cntAppoints"
				Grid.Row="0"
				VerticalOptions="Fill" HorizontalOptions="Fill"
				GridLinesDisplayMode="Show" 
				ViewMode="Day"
				 DisplayDateChanged="CntAppoints_DisplayDateChanged"   
				SelectionMode="Single" SelectionChanged="CntAppoints_SelectionChanged" 
				NativeControlLoaded="CntAppoints_NativeControlLoaded"  
				TimeSlotTapped="CntAppoints_TimeSlotTapped"
				ViewChanged="CntAppoints_ViewChanged" CellTapped="CntAppoints_CellTapped" 
				SchedulingUiEnabled="True" AppointmentTapped="CntAppoints_AppointmentTapped"                  >
				<telerikInput:RadCalendar.DayViewSettings>
					<telerikInput:DayViewSettings DayStartTime="00:00:00"
									  DayEndTime="23:40:00"
									  TimelineInterval="15"  />
				</telerikInput:RadCalendar.DayViewSettings>
				<telerikInput:RadCalendar.DayViewStyle>
					<telerikInput:DayViewStyle  
					   
									   AllDayAppointmentFontSize="10"
									   TimelineLabelsTextColor="DarkGray"
									   TimelineLabelsFontSize="10"
									   AppointmentFontSize="10" 
									   AppointmentDetailsFontSize="8"/>
				</telerikInput:RadCalendar.DayViewStyle>
				<telerikInput:RadCalendar.MultiDayViewSettings>
					<telerikInput:MultiDayViewSettings DayStartTime="00:00:00"
									  DayEndTime="23:40:00"
									  TimelineInterval="15"  />
				</telerikInput:RadCalendar.MultiDayViewSettings>
				<telerikInput:RadCalendar.MultiDayViewStyle>
					<telerikInput:MultiDayViewStyle
					   
									   AllDayAppointmentFontSize="10"
									   TimelineLabelsTextColor="DarkGray"
									   TimelineLabelsFontSize="10"
									   AppointmentFontSize="10" 
									   AppointmentDetailsFontSize="8"/>
				</telerikInput:RadCalendar.MultiDayViewStyle>
			</telerikInput:RadCalendar>
			 <telerikInput:RadButton x:Name="btnRefresh" 
							Clicked="BtnRefresh_Clicked" HorizontalContentAlignment="End" VerticalContentAlignment="Center"
							HorizontalOptions="Center" VerticalOptions="Center"  
							BackgroundColor="Transparent"
							Grid.Row="1" Text="Refresh" />
		</Grid>
    </ContentPage.Content>
</ContentPage>
		

       private void BtnRefresh_Clicked(object sender, EventArgs e)
        {

            cntAppoints.DisplayDate = DateTime.Parse("11/05/2019");

            ObservableCollection<AppointmentViewModel> apps = new ObservableCollection<AppointmentViewModel>() {
                    new AppointmentViewModel()
                        {
                            PK =1,
                            Title="Customer 1",
                            StartDate=DateTime.Parse("2019-05-11T08:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T08:45:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =2,
                            Title="Customer 2",
                            StartDate=DateTime.Parse("2019-05-11T08:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T18:00:00"),
                            Detail="Station: STATION 3",
                            IsAllDay=true
                        },
                    new AppointmentViewModel()
                        {
                            PK =3,
                            Title="Customer 3",
                            StartDate=DateTime.Parse("2019-05-11T08:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T08:30:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =4,
                            Title="Customer 4",
                            StartDate=DateTime.Parse("2019-05-11T08:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T08:45:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =5,
                            Title="Customer 5",
                            StartDate=DateTime.Parse("2019-05-11T09:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T09:30:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =6,
                            Title="Customer 6",
                            StartDate=DateTime.Parse("2019-05-11T09:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T09:15:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =7,
                            Title="Customer 7",
                            StartDate=DateTime.Parse("2019-05-11T09:15:00"),
                            EndDate=DateTime.Parse("2019-05-11T10:00:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =8,
                            Title="Customer 8",
                            StartDate=DateTime.Parse("2019-05-11T09:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T09:45:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =9,
                            Title="Customer 9",
                            StartDate=DateTime.Parse("2019-05-11T09:45:00"),
                            EndDate=DateTime.Parse("2019-05-11T10:30:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                                        {
                            PK =10,
                            Title="Customer 10",
                            StartDate=DateTime.Parse("2019-05-11T10:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T10:30:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =11,
                            Title="Customer 11",
                            StartDate=DateTime.Parse("2019-05-11T11:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T12:15:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =12,
                            Title="Customer 12",
                            StartDate=DateTime.Parse("2019-05-11T12:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T12:45:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =13,
                            Title="Customer 13",
                            StartDate=DateTime.Parse("2019-05-11T12:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T13:15:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =14,
                            Title="Customer 14",
                            StartDate=DateTime.Parse("2019-05-11T12:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T13:00:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =15,
                            Title="Customer 15",
                            StartDate=DateTime.Parse("2019-05-11T13:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T13:15:00"),
                            Detail="Station: STATION 2"
                        },
                    new AppointmentViewModel()
                        {
                            PK =16,
                            Title="Customer 16",
                            StartDate=DateTime.Parse("2019-05-11T13:15:00"),
                            EndDate=DateTime.Parse("2019-05-11T13:30:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =17,
                            Title="Customer 17",
                            StartDate=DateTime.Parse("2019-05-11T13:15:00"),
                            EndDate=DateTime.Parse("2019-05-11T13:30:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                                        {
                            PK =18,
                            Title="Customer 18",
                            StartDate=DateTime.Parse("2019-05-11T13:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T14:00:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =19,
                            Title="Customer 19",
                            StartDate=DateTime.Parse("2019-05-11T13:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T14:00:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =20,
                            Title="Customer 20",
                            StartDate=DateTime.Parse("2019-05-11T14:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T14:30:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =21,
                            Title="Customer 21",
                            StartDate=DateTime.Parse("2019-05-11T14:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T15:00:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =22,
                            Title="Customer 22",
                            StartDate=DateTime.Parse("2019-05-11T14:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T15:00:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =23,
                            Title="Customer 23",
                            StartDate=DateTime.Parse("2019-05-11T15:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T15:30:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =24,
                            Title="Customer 24",
                            StartDate=DateTime.Parse("2019-05-11T15:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T15:45:00"),
                            Detail="Station: Station 1nServices: head massage and shampoo, short to medium blowdry"
                        },
                    new AppointmentViewModel()
                        {
                            PK =25,
                            Title="Customer 25",
                            StartDate=DateTime.Parse("2019-05-11T15:15:00"),
                            EndDate=DateTime.Parse("2019-05-11T15:30:00"),
                            Detail="Station: STATION 2"
                        },
                    new AppointmentViewModel()
                        {
                            PK =26,
                            Title="Customer 26",
                            StartDate=DateTime.Parse("2019-05-11T15:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T16:00:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =27,
                            Title="Customer 27",
                            StartDate=DateTime.Parse("2019-05-11T15:45:00"),
                            EndDate=DateTime.Parse("2019-05-11T16:15:00"),
                            Detail="Station: STATION 2"
                        },
                    new AppointmentViewModel()
                        {
                            PK =28,
                            Title="Customer 28",
                            StartDate=DateTime.Parse("2019-05-11T16:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T16:30:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =29,
                            Title="Customer 29",
                            StartDate=DateTime.Parse("2019-05-11T16:30:00"),
                            EndDate=DateTime.Parse("2019-05-11T16:45:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =30,
                            Title="Customer 30",
                            StartDate=DateTime.Parse("2019-05-11T16:45:00"),
                            EndDate=DateTime.Parse("2019-05-11T17:15:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                        {
                            PK =31,
                            Title="Customer 31",
                            StartDate=DateTime.Parse("2019-05-11T17:00:00"),
                            EndDate=DateTime.Parse("2019-05-11T17:30:00"),
                            Detail="Station: STATION 4"
                        },
                    new AppointmentViewModel()
                        {
                            PK =32,
                            Title="Customer 32",
                            StartDate=DateTime.Parse("2019-05-11T17:15:00"),
                            EndDate=DateTime.Parse("2019-05-11T17:45:00"),
                            Detail="Station: Station 1"
                        },
                    new AppointmentViewModel()
                    {
                        PK =33,
                        Title="Customer 33",
                        StartDate=DateTime.Parse("2019-05-11T17:15:00"),
                        EndDate=DateTime.Parse("2019-05-11T17:45:00"),
                        Detail="Station: STATION 4"
                    }

                };
          
            cntAppoints.AppointmentsSource = null;
            cntAppoints.AppointmentsSource = apps;
            //GetData(cntAppoints.DisplayDate);
            //expFilters.IsExpanded = false;
        }