C++ 显示系统时间重载

#include<iostream>
#include<ctime>
using namespace std;
void display(tm *tim)
{
	cout<<"time:"<<asctime(tim)<<endl;
}
void display(time_t *tim)
{
	cout<<"now:"<<ctime(tim)<<endl;
}
int main()
{
	time_t tim=time(0);
	tm *ltime=localtime(&tim);
	display(&tim);
	display(ltime);
	return 0;
}