C++让时间累计加某个数

char *  StartTimeCount(int GapTime)
{
char *Time = this->StartTime;
char * Hour;
char * Min ;
char * Sec ="00";
char *single;
char * StartTime;
int i = 0;

Hour = new char[3];
char *head = Hour;
*Hour = *Time;
Hour++;
Time++;
*Hour = *Time;
Time++;
Hour++;
*Hour = '';
int hour = atoi(head);

Time++;
Min = new char[3];
head = Min;
*Min = *Time;
Min++;
Time++;
*Min = *Time;
Time++;
Min++;
*Min = '';
int min = atoi(head);


min = min+GapTime;
if(min>=60)
{
min = min-60;
hour++;
if(hour>=24)
{
hour=hour-24;
}
}

single = new char[3];
head = single;
*single = '0';
single++;
*single = '';
itoa(hour,Hour,10);
if(hour<10)
{
Hour = strcat(head,Hour);
}

single = new char[3];
head = single;
*single = '0';
single++;
*single = '';
itoa(min,Min,10);
if(min<10)
{
Min = strcat(head,Min);
}

StartTime = new char[11];
*StartTime='';
strcat(StartTime,Hour);
strcat(StartTime,":");
strcat(StartTime,Min);
strcat(StartTime,":");
strcat(StartTime,Sec);
return StartTime;
}

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