/* int	DaysBetweenDates360(m1,d1,y1, m2,d2,y2)
 *
 * ARGUMENT
 *  int	m1,d1,y1;		- Base Date
 *  int	m2,d2,y2;		- Date to compare with base
 *
 * DESCRIPTION
 *  Compares two dates in date args format, forming the	difference in
 *  whole days.	 The result is a signed	number:
 *
 *  In this one, all months are	30 days	(e.g. year is 360 days).
 *
 *	0 if dates are same,
 *	+n if date1 > date2
 *	-n if date1 < date2
 *
 * SIDE	EFFECTS
 *	None.
 *
 * RETURNS
 *  +,-, or 0 days.  0 can indicate an error.
 *
 * POSSIBLE ERROR CODES
 *	GM_ARGVAL
 *	GM_OVERFLOW
 *
 * AUTHOR
 *     05-Aug-1987  12:43:39
 *   Copyright (C) 1987-1990 Greenleaf Software	Inc.  All rights reserved.
 *
 * MODIFICATIONS
 */
#include <stdio.h>
#include "gmsystem.h"

int DaysBetweenDates360(m1,d1,y1,m2,d2,y2)
int m1,d1,y1,m2,d2,y2;
{
	long	n;

	_MacStart(GM_DBD360);
	if (m1<1||m1>12||d1<1||d1>31||y1<0||y1>9999||
		m2<1||m2>12||d2<1||d2>31||y2<0||y2>9999) {
		_MacErr(GM_ARGVAL);
		_MacRet(0);
	}

	if (d2==31)
		d2=30;
	if (d1==31 && d2>=30)
		d1=30;
	n = (long) (y1-y2) * 360L + (long) ((m1	- m2) *	30 + (d1 - d2));
	if (n<-32768L || n>32767L)  {
		_MacErr(GM_OVERFLOW);
		_MacRet(0);
	}

	_MacRet((int) n);
}