比較兩個任意日期的時間差

int cmptime(char *s_time,char *e_time){
 int delta_sec;
 int s_time_array[6],e_time_array[6];//[Y][M][D][h][m][s]
 long long delta_s;
 int delta_m,delta_h,delta_D;
 char str_buf1[5],str_buf2[5];
 int i=0,j=0;

 //retreive data
 while(1){
  str_buf1[i]=*s_time;          
  str_buf2[i]=*e_time;
  s_time++;
  e_time++;
  i++;
  if(((*s_time == '/')&&(*e_time == '/'))||((*s_time == ':')&&(*e_time == ':'))){
   str_buf1[i]='\0'; //string end
   str_buf2[i]='\0';
   s_time_array[j]=atof(str_buf1);
   e_time_array[j]=atof(str_buf2);  
   memset(str_buf1,0,5);//clean buf.
   memset(str_buf2,0,5);
   i=0;
   s_time++;//next char
   j++;
  }
  else if(*s_time !== '\0'){
   str_buf1[i]='\0'; //string end
   str_buf2[i]='\0';
   s_time_array[j]=atof(str_buf1);
   e_time_array[j]=atof(str_buf2);
   memset(str_buf1,0,5);//clean buf.
   memset(str_buf2,0,5);
   break;
  }
 }
 //compare time

  s_time_array[2]=julian_cnt(s_time_array[0],s_time_array[1],s_time_array[2]);//caculate julian days
  e_time_array[2]=julian_cnt(e_time_array[0],e_time_array[1],e_time_array[2]);
 
  while(s_time_array[0] < e_time_array[0]){ //** plus days if over the year**
   if((s_time_array[0]%4==0 && s_time_array[0]%100!=0) || s_time_array[0]%400==0){ //leap year
    e_time_array[2]=e_time_array[2]+366;
   }
   else{
    e_time_array[2]=e_time_array[2]+365;
   }                    
   s_time_array[0]++;
  }
 
  if((e_time_array[5]-s_time_array[5])<0 delta_sec="delta_sec" nbsp="nbsp" p="p">   delta_s=e_time_array[5]-s_time_array[5]+60;
   e_time_array[4]--;
  }
  else{
   delta_s=e_time_array[5]-s_time_array[5];    
  }
  if((e_time_array[4]-s_time_array[4])<0 delta_min="delta_min" nbsp="nbsp" p="p">   delta_m=e_time_array[4]-s_time_array[4]+60;
   e_time_array[3]--;
  }
  else{
   delta_m=e_time_array[4]-s_time_array[4];    
  }
  if((e_time_array[3]-s_time_array[3)<0 delta_hour="delta_hour" nbsp="nbsp" p="p">   delta_h=e_time_array[3]-s_time_array[3]+24;
   e_time_array[2]--;
  }
  else{
   delta_h=e_time_array[3]-s_time_array[3];    
  }
  if((e_time_array[2]-s_time_array[2)<0 error="error" nbsp="nbsp" p="p">    printf("input error");
    exit(0);
  }
  else{
   delta_D=e_time_array[2]-s_time_array[2]; //delta_day
  }
  delta_s=delta_s+60*delta_m+3600*delta_h+86400*delta_D; //finally convert to numbers in sec


 

 return delta_s;
}

int julian_cnt(int *yr,int *mon,int *day){
 int jday=0;
 int year_day[12];
 int i=0;

 if((*yr%4==0 && *yr%100!=0) || *yr%400==0){ //leap year
   day_yr[12]={31 29 31 30 31 30 31 31 30 31 30 31};
 }
 else{ //common year
   day_yr[12]={31 28 31 30 31 30 31 31 30 31 30 31};
 }
 while(i+1 != *mon){
  jday=jday+day_yr[i];
 }
 jday=jday+*day;

 return jday;
}