convert series to datetime

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

#define MAX_LENGTH 20

int main() {
    char dateSeries[MAX_LENGTH][20] = {
        "2023-01-01", "2023-02-15", "2023-03-30",
        "2023-04-10", "2023-05-22", "2023-06-05"
    };

    for (int i = 0; i < MAX_LENGTH; i++) {
        struct tm tm_date;
        memset(&tm_date, 0, sizeof(struct tm));

        sscanf(dateSeries[i], "%d-%d-%d",
               &tm_date.tm_year, &tm_date.tm_mon, &tm_date.tm_mday);

        tm_date.tm_year -= 1900;
        tm_date.tm_mon--;

        time_t timestamp = mktime(&tm_date);

        printf("Original: %s, Converted: %s", dateSeries[i], ctime(&timestamp));
    }

    return 0;
}