listcollectionview filtering current month

public class DateComparer : IComparer<DateTime>
{
    public int Compare(DateTime x, DateTime y)
    {
        if (x.Year == y.Year && x.Month == y.Month)
            return 0;
        return 1;
    }
}

//...
ListCollectionView lstCollView = new ListCollectionView(lst);
lstCollView.Filter = (obj) =>
{
    DateTime dt = (DateTime)obj;
    if (dt.Year == DateTime.Now.Year && dt.Month == DateTime.Now.Month)
        return true;
    return false;
};