public void SubstractMonth(int m)
{
if (m < 0)
{
AddMonth(-m);
}
else
{
if (clock == null)
{
setClock();
}
Month[] monthList = clock.getMonthList();
int newMonth = month.Month_number - m;
if (newMonth >= 0)
{
month = monthList[newMonth];
}
else
{
while (newMonth < 0)
{
newMonth += monthList.Length;
if (yearMatters)
{
SubstractYear(1);
}
}
}
}
}
