/// <summary>
/// Subtracts given centuries from the given DateTime.
/// </summary>
/// <param name="date">The given DateTime.</param>
/// <param name="centuries">Number of centuries to be subtracted.</param>
/// <returns>The DateTime after the given centuries are subtracted.</returns>
public static DateTime SubtractCenturies(this DateTime date, int centuries)
{
return(date.AddCenturies(centuries.Negate()));
}
/// <summary>
/// Adds one century to the given DateTime.
/// </summary>
/// <param name="date">The given DateTime.</param>
/// <returns>The DateTime after one century is added.</returns>
public static DateTime AddACentury(this DateTime date)
{
return(date.AddCenturies(1));
}