simple time class

mytime.h

#ifndef TIME_H
#define TIME_H
/* Sarverott 2020 */
//#include <iostream>

//using namespace std;

class time{
    private:
        int hour=0;
        int minute=0;
        int second=0;
    public:
        time(char* line){
            //cout<<"###TIME created!###("<<line<<")\n";
            insertTime(line);
        }
        time(int h, int m, int s){
            //cout<<"###TIME created!("<<h<<":"<<m<<":"<<s<<")###\n";
            insertTime(h, m, s);
        }
        ~time(){
            //cout<<"###TIME destroyed!###\n";
        }
        time(){
            //cout<<"###TIME created!###\n";
        }
        void insertTime(int s){
            insertTime(s/3600, s/60%60, s%60);
        }
        void insertTime(int h, int m, int s){
            this->hour=h;
            this->minute=m;
            this->second=s;
        }
        void insertTime(char* line){
            //cout<<endl<<"TEST HOUR:"<<line<<endl<<endl;
            this->hour=(*(line++)-'0')*10+(*(line++)-'0');
            line++;
            this->minute=(*(line++)-'0')*10+(*(line++)-'0');
            line++;
            this->second=(*(line++)-'0')*10+(*(line++)-'0');
        }
        void clearTime(){
            this->hour=0;
            this->minute=0;
            this->second=0;
        }
        int getHour(){
            return this->hour;
        }
        int getMinute(){
            return this->minute;
        }
        int getSecond(){
            return this->second;
        }
        char* toString(){
            int tmp=this->hour/100;
            int outputLength=8;
            while(tmp!=0){
                tmp/=10;
                outputLength++;
            }
            char* output=new char();
            output[outputLength--]='\0';
            output[outputLength--]='0'+this->second%10;
            output[outputLength--]='0'+this->second/10%10;
            output[outputLength--]=':';
            output[outputLength--]='0'+this->minute%10;
            output[outputLength--]='0'+this->minute/10%10;
            output[outputLength--]=':';
            tmp=this->hour;
            while(tmp!=0){
                output[outputLength--]='0'+tmp%10;
                tmp/=10;
            }
            if(this->hour<10){
                output[0]='0';
            }
            if(this->hour==0){
                output[1]='0';
            }
            //cout<<endl<<output<<endl;
            return output;
        }
        /*void coutPrint(){
            if(this->hour<10)cout<<'0';
            cout<<this->hour;
            cout<<':';
            if(this->minute<10)cout<<'0';
            cout<<this->minute;
            cout<<':';
            if(this->second<10)cout<<'0';
            cout<<this->second;
        }*/
};

#endif // TIME_H