nt main(void)
{
string select;
WorldClock worldClock;
while(true)
{
cin>>select;
if(select=="set")
{
try{
cin>>worldClock;
cout<<worldClock<<endl;
}catch(InvalidTimeException iserr)
{
cout<<"Invalid time: "<<iserr.input_time<<endl;
}
}
else if(select=="tick")
{
int second;
cin>>second;
worldClock.Tick(second);
cout<<worldClock<<endl;
}
ostream& operator<<(ostream& os, const WorldClock& c)
{
WorldClock temp = c;
temp.Tick(temp.time_difference()*secondOfTime);
os << temp.hour() << ":" << temp.minute() << ":" << temp.second();
if (temp.time_difference() >= 0) os << " (+" << temp.time_difference() << ")";
else os << " (" << temp.time_difference() << ")";
return os;
}
int main() {
WorldClock clock;
string cmd;
while (cmd != "quit") {
cin >> cmd;
try {
if (cmd == "set") {
cin >> clock;
cout << clock << endl;
} else if (cmd == "tick") {
int tick = 1;
cin >> tick;
clock.Tick(tick);
cout << clock << endl;
} else if (cmd == "set_timezone") {
