W3School TIY Editor

#include <iostream> #include <ctime> using namespace std; int main() { struct tm date; time_t now; time_t before; // 获取当前时间戳 time(&now); // 获取5小时前的时间戳 date = *localtime(&now); date.tm_hour -= 5; before = mktime(&date); // 计算两个时间戳的差值(秒) cout << difftime(now, before); return 0; }