C语言: 按照格式返回系统时间的的函数[开发备忘]

/*

功能描述：获取当前的系统时间格式YYYYMMDDhhmmss，精确到秒

参数描述：char * curtime传地址方式传入的参数，用于返回指定格式的时间字符串，

int flag： 1-将时间做成YYYYMMDDhhmmss格式 2-将时间做成YYYY-MM-DD hh:mm:ss格式 3-将时间做成YYYYMMDD格式

返回参数：无 (格式为YYYYMMDDhhmmss或者为YYYY-MM-DD hh:mm:ss的字符串)

*/

void get_curtime(int flag,char * timeformat)

{

char outstr[128];

char str[100];

time_t t;

struct tm *gmt, *area;

t = time(NULL);

area = localtime(&t);

memset(outstr,0x0,sizeof(outstr));

if(flag==1)

{

sprintf(str,"%4d",1900+area->tm_year);

strcat(outstr,str);

sprintf(str,"%02d",area->tm_mon+1);

strcat(outstr,str);

sprintf(str,"%02d",area->tm_mday);

strcat(outstr,str);

sprintf(str,"%02d",area->tm_hour);

strcat(outstr,str);

sprintf(str,"%02d",area->tm_min);

strcat(outstr,str);

sprintf(str,"%02d",area->tm_sec);

strcat(outstr,str);

}

else if(flag==3)

{

sprintf(str,"%4d",1900+area->tm_year);

strcat(outstr,str);

sprintf(str,"%02d",area->tm_mon+1);

strcat(outstr,str);

sprintf(str,"%02d ",area->tm_mday);

strcat(outstr,str);

}

else

{

sprintf(str,"%4d-",1900+area->tm_year);

strcat(outstr,str);

sprintf(str,"%02d-",area->tm_mon+1);

strcat(outstr,str);

sprintf(str,"%02d ",area->tm_mday);

strcat(outstr,str);

sprintf(str,"%02d:",area->tm_hour);

strcat(outstr,str);

sprintf(str,"%02d:",area->tm_min);

strcat(outstr,str);

sprintf(str,"%02d",area->tm_sec);

strcat(outstr,str);

}

strcpy(timeformat,outstr);

}