/// <summary>
 /// Returns a new JewishDate with the TimeSpan subtracted.
 /// </summary>
 /// <param name="timeSpan">The TimeSpan to be subtracted</param>
 /// <returns></returns>
 public JewishDate Subtract(TimeSpan timeSpan)
 {
     return(new JewishDate(GregDate.Subtract(timeSpan)));
 }
 /// <summary>
 /// Returns a new JewishDate with the TimeSpan added.
 /// </summary>
 /// <param name="timeSpan">The TimeSpan to be added</param>
 /// <returns></returns>
 public JewishDate Add(TimeSpan timeSpan)
 {
     return(new JewishDate(GregDate.Add(timeSpan)));
 }