MainWindow.xaml

<Window x:Class="Data_Binding.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:syncfusion="http://schemas.syncfusion.com/wpf" 
        xmlns:local="clr-namespace:Data_Binding"
        mc:Ignorable="d" WindowStartupLocation="CenterScreen"
        Title="DateTimeEdit - DataBinding" Height="650" Width="600">
    <Window.DataContext>
        <local:ViewModel/>
    </Window.DataContext>
    <Grid>
        <StackPanel Orientation="Horizontal" >
            <syncfusion:DateTimeEdit DateTime="{Binding SelectedDateTime,Mode=TwoWay}" 
                                     Name="dateTimeEdit1" 
                                     Width="150" 
                                     Height="25" 
                                     Margin="100"/>

            <syncfusion:DateTimeEdit DateTime="{Binding SelectedDateTime,Mode=TwoWay}" 
                                     Name="dateTimeEdit2" 
                                     Width="150" 
                                     Height="25"/>
        </StackPanel>
    </Grid>
</Window>