Format Expiration Date from Whois to .br and .com

format_data_exp_whois.c

#include <stdio.h>
#include <string.h>
#include <time.h>

char *ret_num_month(char *nm_month);
char *ret_num_month(char *nm_month){
    typedef struct param{
        char *chave;
        char *valor;
    } param;

    param month[] = {
        {"jan","01"},
        {"feb","02"},
        {"mar","03"},
        {"apr","04"},
        {"may","05"},
        {"jun","06"},
        {"jul","07"},
        {"aug","08"},
        {"sep","09"},
        {"oct","10"},
        {"nov","11"},
        {"dec","12"},
        {NULL, NULL}
    };
    int i = 0;
    while(month[i].chave != NULL){
        if(!strcasecmp(month[i].chave, nm_month)){
            printf("number month found %s:%s\n", month[i].chave, month[i].valor); 
            return month[i].valor;
        }
        i++;
    }

    return NULL;
}
int format_date_wcom(char *data_com, char *datetime);
int format_date_wcom(char *data_com, char *datetime){
    data_com++;
    printf("[%s:%d]:%s\n", __FUNCTION__, __LINE__, data_com);
    char *day = strtok(data_com , "-");
    day++;
    printf("[%s:%d]:%s\n", __FUNCTION__, __LINE__, day);
    
    char *month = strtok(NULL, "-");
    printf("[%s:%d]:%s\n", __FUNCTION__, __LINE__, month);
    month = ret_num_month(month);
    printf("[%s:%d]:number month %s\n", __FUNCTION__, __LINE__, month);
    
    char *year = strtok(NULL, "-");
    printf("[%s:%d]:%s\n", __FUNCTION__, __LINE__, year);

    snprintf(datetime, 40, "%s-%s-%sT12:12:12.0Z",year, month, day);
    printf("datetime whois .com %s\n", datetime);
    
    return 0;
}
int format_date_wbr(char *data_br, char *datetime);
int format_date_wbr(char *data_br, char *datetime){
    printf("[%s:%d]:%s\n", __FUNCTION__, __LINE__, data_br);
    int i,j = 0;
    char *aux = NULL;
    char day[3];
    char month[3];
    char year[5];
    memset(year, '\0', sizeof(year));
    memset(month, '\0', sizeof(month));
    memset(day, '\0', sizeof(day));

    for(i = 0; *(data_br+i) != '\0'; i++ ){
        if(!isspace(data_br[i])){
            if(j<4){
                *(year+strlen(year)) = *(data_br+i);
            } else if(j>3 && j<6){
                *(month+strlen(month)) = *(data_br+i);
            } else if(j>5 && j<8){
                *(day+strlen(day)) = *(data_br+i);
            }
            j++;
        }
    }
    *(year+strlen(year)) = '\0';
    *(month+strlen(month)) = '\0';
    printf("year %s\n", year);
    printf("month %s\n", month);
    printf("day %s\n", day);
    
    snprintf(datetime, 40, "%s-%s-%sT12:12:12.0Z",year, month, day);
    printf("datetime whois .br %s\n", datetime);
    
    return 0;
}
int main(){
    char dt_exp_br[100] = "expires:     20191117\
        ";
    char dt_exp_com[100] = "Expiration Date: 05-aug-2019";
    printf("%s\n", dt_exp_br);
    printf("%s\n", dt_exp_com);

    char *data_br = strtok(dt_exp_br,"expires:");
    printf("dt_exp_br %s\n",data_br);

    char *data_com = strchr(dt_exp_com, ':');
    printf("dt_exp_com %s\n",data_com);

    char datetime[40];
    memset(datetime, '\0', sizeof(datetime));
    format_date_wcom(data_com, datetime);
    printf("datetime whois .com %s\n", datetime);

    format_date_wbr(data_br, datetime);
    printf("datetime whois .br %s\n", datetime);

    return 0;
}

Output:

expires:     20191117        
Expiration Date: 05-aug-2019
dt_exp_br      20191117        
dt_exp_com : 05-aug-2019
[format_date_wcom:41]: 05-aug-2019
[format_date_wcom:44]:05
[format_date_wcom:47]:aug
number month found aug:08
[format_date_wcom:49]:number month 08
[format_date_wcom:52]:2019
datetime whois .com 2019-08-05T12:12:12.0Z
datetime whois .com 2019-08-05T12:12:12.0Z
[format_date_wbr:61]:     20191117        
year 2019
month 11
day 17
datetime whois .br 2019-11-17T12:12:12.0Z
datetime whois .br 2019-11-17T12:12:12.0Z