C++ 计算任意两个日期之间的天数

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C++写的一个计算两个日期之间天数的小程序：

#include <Windows.h>#include <stdio.h>struct tagDate{ int year;int month;int day;};//设置日期void SetDate(int y, int m, int d, tagDate *date){ date->year = y;date->month = m;date->day = d;} //是否闰年int IsLeapYear(int year)  { return ((year%4==0) && (year%100!=0)||year%400==0); } //得到date.month的最大天数int GetLastDay(tagDate date) { int num;switch(date.month) {case 1:case 3:case 5:case 7:case 8:case 10:case 12:num=31;break;case 2:num = 28+IsLeapYear(date.year); break; default: num = 30; } return num; }//日期是否合法int IsDateValid(tagDate date){ if(date.year <0 || date.month <1 || date.month> 12) return 0;if(date.day <1 || date.day> GetLastDay(date))return 0;return 1;} //date+1void AddDay(tagDate *date){date->day++;if(date->day > GetLastDay(*date)){date->day = 1;date->month++;if(date->month > 12){date->month = 1;date->year++;}}}//date1比date2小返回值为1，否则为0int Compare(tagDate date1, tagDate date2){if(date1.year < date2.year)return 1;if(date1.year <= date2.year && date1.month < date2.month)return 1;if(date1.year <= date2.year && date1.month <= date2.month && date1.day < date2.day)return 1;return 0;} //计算两个日期的间隔天数long DateDiff(tagDate date1, tagDate date2){long delta = 0;tagDate date3;//若date1 > date2,交换date1,date2if(!Compare(date1, date2)){date3 = date2;date2 = date1;date1 = date3;}//date1比date2少时，date1日期加1while(Compare(date1,date2)){AddDay(&date1);delta++;}return delta;} void main(){tagDate date1, date2;int y, m, d;system("cls");while(1){puts("\nInput   date1\t ");scanf("%d,%d,%d", &y, &m, &d);SetDate(y, m, d, &date1);if(!IsDateValid(date1)){ puts( "date1   is   invalid !");exit(1);}puts("\nInput   date2\t ");scanf("%d,%d,%d", &y, &m, &d);SetDate(y, m, d, &date2);if(!IsDateValid(date2)){puts( "date2   is   invalid !");exit(1);}//printf("\nResult : [%ld]", DateDiff(date1,date2));}}

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