C获取系统时间

/*

	功能：		获取当前系统时间

	返回值：	0-成功，1-失败

	out:		保存返回的系统时间，格式由fmt决定

	fmt:		0-返回：yyyy-mm-dd hh24:mi:ss, 1-返回：yyyy-mm-dd, 2-返回：hh24:mi:ss

*/

int getTime(char *out, int fmt)					// 获取当前系统时间

{

	if(out == NULL)

		return -1;



	time_t t;

	struct tm *tp;

	t = time(NULL);



	tp = localtime(&t);

	if(fmt == 0)

		sprintf(out, "%2.2d-%2.2d-%2.2d %2.2d:%2.2d:%2.2d", tp->tm_year+1900, tp->tm_mon+1, tp->tm_mday, tp->tm_hour, tp->tm_min, tp->tm_sec);

	else if(fmt == 1)

		sprintf(out, "%2.2d-%2.2d-%2.2d", tp->tm_year+1900, tp->tm_mon+1, tp->tm_mday);

	else if(fmt == 2)

		sprintf(out, "%2.2d:%2.2d:%2.2d", tp->tm_hour, tp->tm_min, tp->tm_sec);

	return 0;

}

测试代码：

char cDir[100] = {0};

    getTime(cDir, 0);
    printf("%s\n", cDir);
    getTime(cDir, 1);
    printf("%s\n", cDir);
    getTime(cDir, 2);
    printf("%s\n", cDir);

运行结果 如：

2011-04-09 23:30:13
2011-04-09
23:30:13