calculationday.c

关于在LINUX下的计算日期时间的代码.计算N天后,或者N天前的日期.

/************************************************************************/
/*                                                                      */
/*  僾儘僙僗柤丗 巜掕擔晅偺N擔屻偺擔晅傪庢摼偡傞              丂丂丂  丂*/
/*  娭  悢  柤丗 calculationDay 丂丂丂丂                                */
/*  婡擻奣梫  丗 巜掕擔晅偺N擔屻偺擔晅傪庢摼偡傞                        */
/*  曉媝抣    丗 惓忢廔椆 0                                             */
/*            丗 堎忢廔椆 -1                                            */
/*  拲堄帠崁  丗 摿偵側偟                                               */
/*                                                                      */
/*  僷儔儊乕僞丗IN 丗char* pc_date      寁嶼慜擔晅                      */
/*                   int   i_addDay     捛壛擔悢                        */
/*              OUT丗char* pc_resultDate   寁嶼屻擔晅                   */
/*                                                                      */
/*  怴婯嶌惉幰丗妿巙暉                                                  */
/*  怴婯嶌惉擔丗2005擭06寧24擔                                          */
/*  僶乕僕儑儞丗Ver1.1.0                                                */
/*  廋惓幰丗   妿巙暉                                                   */
/*  廋惓擔丗   2005擭07寧07擔                                           */
/*  僶乕僕儑儞:Ver1.2.0                                                 */
/*                                                                      */
/************************************************************************/
/*----------------------------------------------------------------------*/
/*                          僀儞僋儖乕僪                                */
/*----------------------------------------------------------------------*/
#include<string.h>
#include<stdio.h>
#include<time.h>
#define DATE_SIZE  8
#define YEAR_SIZE  4
#define MONTH_SIZE 2
#define DAY_SIZE   2

int calculationDay(const char *pc_date,int i_addDay,char *pc_resultDate){

    char pc_year[YEAR_SIZE + 1];
    char pc_month[MONTH_SIZE + 1];
    char pc_day[DAY_SIZE + 1];
    int  i_year;
    int  i_month;
    int  i_day;
    struct tm st_creTime;
    int  i_getYear;
    int  i_getMonth;
    int  i_getDay;

    printf("擔晅寁嶼張棟奐巒\n");
    /* 弶婜壔 */
    memset(pc_year,0,sizeof(pc_year));
    memset(pc_month,0,sizeof(pc_month));
    memset(pc_day,0,sizeof(pc_day));

    /* 僷儔儊乕僞偐傜擭丒寧丒擔傪庢摼 */
    strncpy(pc_year,pc_date,YEAR_SIZE);
    strncpy(pc_month,pc_date+YEAR_SIZE,MONTH_SIZE);
    strncpy(pc_day,pc_date+YEAR_SIZE+MONTH_SIZE,DAY_SIZE);
    i_year=atoi(pc_year);
    i_month=atoi(pc_month);
    i_day=atoi(pc_day);

    /* 僒僀僘僠僃僢僋 */
    printf("僒僀僘僠僃僢僋\n");
    if ( strlen(pc_year) > YEAR_SIZE ) {
        printf("擭僒僀僘僄儔乕");
        printf("擔晅寁嶼張棟堎忢廔椆");
        exit(2);
    }
    if ( strlen(pc_month) > MONTH_SIZE ) {
        printf("寧僒僀僘僄儔乕");
        printf("擔晅寁嶼張棟堎忢廔椆");
        exit(2);
    }
    if ( strlen(pc_day) > DAY_SIZE ) {
        printf("擔僒僀僘僄儔乕");
        printf("擔晅寁嶼張棟堎忢廔椆");
        exit(2);
    }

    /* 擭丒寧丒擔傪struct tm峔憿懱偵戙擖 */
    st_creTime.tm_year  = i_year-1900;
    st_creTime.tm_mon   = i_month-1;
    st_creTime.tm_mday  = i_day+i_addDay;
    st_creTime.tm_hour  = 0;
    st_creTime.tm_min   = 0;
    st_creTime.tm_sec   = 0;
    st_creTime.tm_isdst = -1;

    /* 寁嶼屻偺擔晅傪媮傔傞 */
    printf("寁嶼屻偺擔晅傪媮傔傞\n");
    if ( mktime(&st_creTime) == -1 ) {
       printf("擔晅寁嶼張棟堎忢廔椆");
       return 0;
    }
    i_getYear  = st_creTime.tm_year+1900;
    i_getMonth = st_creTime.tm_mon+1;
    i_getDay   = st_creTime.tm_mday;

    /* 擭悢偺僠僃僢僋 */
    if ( i_getYear < 1 || i_getYear > 9999 ) {
        printf("擔晅寁嶼張棟堎忢廔椆");
        exit(2);
    }

    /* 寁嶼屻擔晅傪堷悢偵愝掕 */
    sprintf(pc_resultDate,"%04d%02d%02d",i_getYear,i_getMonth,i_getDay);
    return 0;
}
int main(void)
{
    char pc_ymd[]="20040301";
    int addDay=-1;
    char pc_resultYmd[DATE_SIZE+1];
    memset(pc_resultYmd,0,sizeof(pc_resultYmd));
    int i_return = calculationDay(pc_ymd,addDay,pc_resultYmd);
    if(i_return!=0){
        printf("Error!");
        exit(2);
    }
    sleep(1000);
    printf("Result date is:%s\n",pc_resultYmd);
    sleep(1000);
    return 0;
}