public static Hour Subtract(Hour hour, int numPeriods) => hour.Offset(-numPeriods);
public static Hour Add(Hour hour, int numPeriods) => hour.Offset(numPeriods);
public static Hour Subtract(Hour hour, int numPeriods) => hour.Offset(-numPeriods);
public static Hour Add(Hour hour, int numPeriods) => hour.Offset(numPeriods);