date-and-time.cpp
#include <ctime> // current system time time_t now = time(0); // 1604402281 // convert to string string now_string = ctime(&now); // Tue Nov 3 12:18:01 2020 // convert to UTC tm *ltm = localtime(&now); // year cout << 1900 + ltm -> tm_year << endl; // 2020 // month cout << 1 + ltm -> tm_mon << endl; // 11 // day cout << ltm -> tm_mday << endl; // 3 // time cout << 5 + ltm -> tm_hour << ":" << 30 + ltm -> tm_min << ":" << ltm -> tm_sec << endl; // 17:49:25