.pwn(17) : error 017: undefined symbol "mktime"

new BANDATE = gettime()+mktime(HODINA,MINUTA,0,DEN,MESIAC,ROK);

[b]$i = 0;
while($i==2) {
$i ++;
echo"Sem zvědavej kdy to skončí.";
$i --;
}
[/b]

if(sscanf(params, "iiiiii", ID,ROK,MESIAC,DEN,HODINA,MINUTA)) return SendClientMessage(playerid, 0xFFFFFFFF, "/timeban [playerid] [rok] [mesiac] [den] [hodina] [minuta]");
if(!IsPlayerConnected(ID)) return SendClientMessage(playerid, 0xFFFFFFFF, "ID nieje online!");
new BANDATE = gettime()+mktime(HODINA,MINUTA,0,DEN,MESIAC,ROK);

C:\Users\Lukáš\Desktop\Pawno 0.3c\timeban.pwn(17) : error 017: undefined symbol "mktime"
Pawn compiler 3.2.3664           Copyright (c) 1997-2006, ITB CompuPhase


1 Error.

new BANDATE = gettime()+mktime(HODINA,MINUTA,0,DEN,MESIAC,ROK);

stock mktime(hour,minute,second,day,month,year) {
   new timestamp2;

   timestamp2 = second + (minute * 60) + (hour * 3600);

   new days_of_month[12];

   if ( ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0) ) {
         days_of_month = {31,29,31,30,31,30,31,31,30,31,30,31}; // Schaltjahr
      } else {
         days_of_month = {31,28,31,30,31,30,31,31,30,31,30,31}; // keins
      }
   new days_this_year = 0;
   days_this_year = day;
   if(month > 1) { // No January Calculation, because its always the 0 past months
      for(new i=0; i<month-1;i++) {
         days_this_year += days_of_month[i];
      }
   }
   timestamp2 += days_this_year * 86400;

   for(new j=1970;j<year;j++) {
      timestamp2 += 31536000;
      if ( ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0) )  timestamp2 += 86400; // Schaltjahr + 1 Tag
   }

   return timestamp2;
}