Comments by Tamal Banerjee (Top 2 by date)

private string _bDt;

public string BDt

{
 get {
 DateTime dt;
 var b = DateTime.TryParse(_bDt, out dt);
 return b ? dt.ToString("yyyy-MM-dd") : _bDt;
}

set {   SetValue(ref _bDt, value); }}