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I keep getting this damn error!

(48967) : error 021: symbol already defined: "mktime"

Код:

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;

Can someone please explain to me what to do with this?