Thread: Results in Debug and Release mode are different

Hi!,

I've created three functions that would work together in order to generate a date is string YYYY-MM-DD format.
The code works fine in Debug mode.The problem is when I try to run this code in the Release mode.
It (the program) gives me two different results when I run it in Debug and Release mode.
And no compile error and warning are present when I compile it in those two modes respectively.


here is the code

Code:

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

#define HOUR 261
#define MINUTE 262
#define DAY 263
#define MONTH 264
#define YEAR 265


void padUpString(char *str, char* filler, int len, int fillAtTheEnd)
{

	int i;
	char newstr[50]="";
	
	int strLen = strlen(str);
	int diff = len - strLen;


	if (strLen < len)
	{
		for (i=0; i< len ; i++)
		{
			if (fillAtTheEnd)
			{
				if( i >= strLen) *(str+strLen++)=*filler;
			}else
			{
			     if( i < diff) strcat(newstr,filler);

			}
		}
		if (!fillAtTheEnd)
		{
			strcat(newstr,str);
			strcpy(str,newstr);
		}
	}
}


int getCurrentTimeValue(int timeElement)
{
	struct tm *tm_today;
	time_t t;

	t = time(NULL);
	tm_today = localtime(&t);
	//printf("timeElement is %d\n",timeElement);

	if (timeElement == HOUR)
	{
		return tm_today->tm_hour;
	}
	if (timeElement == MINUTE)
	{
		return tm_today->tm_min;
	}
	if (timeElement == DAY)
	{
		//printf("DAY is %d\n",timeElement); //for debug purposes
		return tm_today->tm_mday;
	}
	if (timeElement == MONTH)
	{
		//printf("MONTH is %d\n",timeElement);//for debug purposes
		return tm_today->tm_mon + 1;
	}
	if (timeElement == YEAR)
	{
		//printf("YEAR is %d\n",timeElement);//for debug purposes
		return tm_today->tm_year + 1900;
	}
	return -1;
}


void getProcessDate(char *procDate)
{
	//YYYY-MM-DD
	char currentTime[11];
	char year[4];
	char day[2];
	char month[2];

	sprintf(year,"%d",getCurrentTimeValue(YEAR));
	sprintf(month,"%d",getCurrentTimeValue(MONTH));
	sprintf(day,"%d",getCurrentTimeValue(DAY));

	printf("\nCheck date\n"); // for testing purpose only
	printf("year [%s]\n",year);
	printf("month [%s]\n",month);
	printf("day [%s]\n",day);


	padUpString(month,"0",2,0);
	padUpString(day,"0",2,0);

	printf("\nAfter padding\n");// for testing purpose only
	printf("month [%s]\n",month);
	printf("day [%s]\n",day);

	sprintf(currentTime,"%s-%s-%s",year,month,day);
	currentTime[10] = '\0';
	memcpy(procDate,currentTime,sizeof(currentTime));
}


int main()
{
	char date[30];
	getProcessDate(date);
	printf("%s\n",date);
	return 0;

}

the output
Debug Mode

Check date
year [2006]
month [5]
day [24]

After padding
month [05]
day [24]
2006-05-24

Release Mode

Check date
year [2006]
month []
day [24]

After padding
month [00]
day [2400]
-00-2400

as you can see the "month" in Release mode is blank,which I suspect is the one causing the problem.

Does anyone know why the results are different?
and how would I fix such problem?

I'm using MVC6 in Win2K

Regards,
jaro