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Calculating Yesterday's Date

hookster007 (55)
Hey guys, quick question. I have a program I am writing that is supposed to calculate tomorrow's date and yesterday's date. I have tomorrow figured out, but I need help with yesterday. Here is the code from tomorrow();
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 void Date::tomorrow()
{
	{
	int m = month, d = day, y = year;

	switch(m)


	{case 1: case 3: case 5: case 7: case 8: case 10: case 12:
		if(d < 30)
		{d ++; break;}

		else if((d <= 31) && (m < 11))
		{m ++;d = 1;break;}

		else if((d <= 31) && (m >= 12))
		{y ++;m = 1;d = 1;break;}


	case 4: case 6: case 9: case 11:
		if(d < 29)
		{d ++;break;}

		else if(d <= 30)
		{m ++;d = 1;break;
		}


	case 2: //February
		if((leapyear(y)) && (d < 29))
		{d ++;break;}

		else if((!(leapyear(y))) && (d < 28))
		{d ++;break;}

		else if((leapyear(y)) && (d >= 29))
		{m ++;d = 1;break;}

		else if ((!(leapyear(y))) && (d >= 28))
		{m ++; d = 1; break;}


	}
	cout << m << "-" << d << "-" << y << endl;
	}
}
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