#include <stdlib.h>/******************************************************************功能: 输入年月日，计算距离1970年1月1日的天数输入:    年月日，输入年份范围【1970，2100】，输入年月日的有效性需要判断输出:     DaysSince1970：距离1970年1月1日的天数     已知 1970年1月1日为星期四     异常时，输出不需要关注返回:1 上班0 休假-1 表示异常     根据国家规定：周一到周五需要上班。     根据公司规则：月末周六需要上班。     注：由于项目紧张，国家规定的节假日如果在周一到周五需要上班^_^。举例：    输入：Year = 1970, Month = 1, Day = 3 ，输出 2，返回值为 0 休假********************************************************************/#define IS_LEAP_YEAR(y) ((y) / 4 - (y) / 100 + (y) / 400 - (y - 1) / 4 + (y - 1) / 100 - (y - 1) / 400)int DayNumber[][13] = {{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, {0, 31, 29, 31, 30, 31, 30, 31, 31, 30,                                                                             31, 30, 31}};int dayofweek(int y, int m, int d) // 0  =  Sunday{    static int t[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};    y -= m < 3;    return (y + y / 4 - y / 100 + y / 400 + t[m - 1] + d) % 7;}int accumulationdayfrom1970(int *DaysSince1970, int Year, int Month, int Day){    *DaysSince1970 = 0;    for (int i = 1970; i < Year; i++)    {        if (IS_LEAP_YEAR(i))        {            *DaysSince1970 += 366;        }        else        {            *DaysSince1970 += 365;        }    }    for (int i = 1; i < Month; i++)    {        int xs = IS_LEAP_YEAR(Year);        *DaysSince1970 += DayNumber[IS_LEAP_YEAR(Year)][i];    }    *DaysSince1970 += Day - 1;    return *DaysSince1970;}int GetCurrentDate(int *DaysSince1970, int Year, int Month, int Day){    if (NULL == DaysSince1970)    {        return -1;    }    if ((Year < 1970) || (Year > 2100))    {        return -1;    }    if ((Month > 12) || (Month <= 0))    {        return -1;    }    int IsLeapYear = IS_LEAP_YEAR(Year); // 闰年返回1    int weekday = dayofweek(Year, Month, Day);    if ((Day > DayNumber[IsLeapYear][Month]) || (Day <= 0))    {        return -1;    }    *DaysSince1970 = accumulationdayfrom1970(DaysSince1970, Year, Month, Day);    if ((0 < weekday) && (weekday < 6))    {        return 1;    }    else if (0 == weekday)    {        return 0;    }    if (weekday == 6)    {        if (IsLeapYear)        {            switch (Month)            {            case 1:            case 3:            case 5:            case 7:            case 8:            case 10:            case 12:                if ((25 <= Day) && (Day <= 31))                {                    return 1;                }                else                {                    return 0;                }                break;            case 4:            case 6:            case 9:            case 11:                if ((24 <= Day) && (Day <= 30))                {                    return 1;                }                else                {                    return 0;                }                break;            case 2:                if ((23 <= Day) && (Day <= 29))                {                    return 1;                }                else                {                    return 0;                }                break;            default:                ;            }        }        else        {            switch (Month)            {            case 1:            case 3:            case 5:            case 7:            case 8:            case 10:            case 12:                if ((25 <= Day) && (Day <= 31))                {                    return 1;                }                else                {                    return 0;                }                break;            case 4:            case 6:            case 9:            case 11:                if ((24 <= Day) && (Day <= 30))                {                    return 1;                }                else                {                    return 0;                }                break;            case 2:                if ((22 <= Day) && (Day <= 28))                {                    return 1;                }                else                {                    return 0;                }                break;            default:                ;            }        }    }    return -1;}