timeManager.c

#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
/* additional imports */
#include "timeManager.h"

/*
    Convert a string to a time_t struct
    The string should be in the format "YYYYMMDDTHHMMSS"
*/
time_t processStringToTimeStruct(char *timeString) 
{
    char* dateStartToken;
    struct tm tm = {0};
    time_t time;
    if (strstr(timeString, "TZID") != NULL) {
        dateStartToken = strchr(timeString, ':') + 1;
    } else {
        dateStartToken = timeString;
    }
    if (sscanf(dateStartToken, "%4d%2d%2dT%2d%2d%2d", 
               &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
               &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
        return -1; 
    }

    tm.tm_year -= 1900; 
    tm.tm_mon -= 1;

    time = mktime(&tm);
    if (time == -1) {
        return -1;
    }

    return time;
}

/* 
    Convert time_t back to string YYYYMMDDTHHMMSS 
*/
char *processTimeStructToString(const time_t *time) 
{
    struct tm *timeStruct = localtime(time);
    char *timeString = (char *)malloc(15);
    snprintf(timeString, 15, "%d%02d%02dT%02d%02d%02d", timeStruct->tm_year + 1900, timeStruct->tm_mon + 1, timeStruct->tm_mday, timeStruct->tm_hour, timeStruct->tm_min, timeStruct->tm_sec);
    return timeString;
}

/*
    Print time_t to stdout
*/
void printTime(const time_t *time) 
{
    printf("Time: %s", ctime(time));
}