Create a class called TimeEditorDescriptor.cs

    [EditorDescriptorRegistration(TargetType = typeof(DateTime?), UIHint = "TimeOnly")]
    public class TimeEditorDescriptor : EditorDescriptor
    {
        public override void ModifyMetadata(ExtendedMetadata metadata, IEnumerable<Attribute> attributes)
        {
            ClientEditingClass = "dijit/form/TimeTextBox";
            base.ModifyMetadata(metadata, attributes);
        }
    }

Use this hint on properties such as the following

        [Display(
            GroupName = SystemTabNames.Content,
            Order = 2,
            Name = "Time")]
        [UIHint("TimeOnly")]
        public virtual DateTime? StartDate { get; set; }

 It resolved my issue. Thanks, Scott Reed for the quick response. It's working as expected. 

I have the other question on displaying time, How to display the time format like HH:MM instead of hh:mm tt ? What kind of Attribute or Property need to be set in code?

MM is month? If you want 24 hour and minutes that's HH:mm

Try changing TimeEditorDescriptor to

    [EditorDescriptorRegistration(TargetType = typeof(DateTime?), UIHint = "TimeOnly")]
    public class TimeEditorDescriptor : EditorDescriptor
    {
        public override void ModifyMetadata(ExtendedMetadata metadata, IEnumerable<Attribute> attributes)
        {
            ClientEditingClass = "dijit/form/TimeTextBox";
            EditorConfiguration["constraints"] = new Dictionary<string, string>
            {
                { "timePattern", "HH:mm" }
            };
            base.ModifyMetadata(metadata, attributes);
        }
    }

Thanks, Scott Reed. It's working as expected.