计算星期几的C代码

static UCHAR   ClkDay;               /* Counters for local 
DATE                                      */
static UCHAR   ClkDOW;               /* Day of week (0 is 
Sunday)                                    */
static UCHAR   ClkMonth;
static UINT    ClkYear;



typedef struct clk_month 
{         
    UCHAR  MonthDays;                /* Number of days in each 
month                                 */
    char  *MonthName;                /* Name of the 
month                                            */
    UCHAR  MonthVal;                 /* Value used to compute day of the 
week                        */
} CLK_MONTH;


static CLK_MONTH code ClkMonthTbl[] = {    /* MONTHS 
TABLE                                                 */
    {0,  "",           0},             /* Invalid 
month                                                */
    {31, "January ",   6},             /* 
January                                                      */
    {28, "February ",  2},             /* February (note leap years are handled 

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