【C++】Linux下计算特定日期与纪元日期差值（秒）

0x00 前言

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0x01 代码实现

#include<iostream>
#include <chrono>
using namespace std;
struct MarkTime {   
    uint32_t year;
    uint32_t month;
    uint32_t day;
    uint32_t hour;
    uint32_t minute;
    uint32_t second;
};
int main(){ 
    auto get_current_seconds = []{ 
        auto sys_clock = std::chrono::time_point_cast<std::chrono::seconds>(std::chrono::system_clock::now());
        auto seconds = std::chrono::duration_cast<std::chrono::seconds>(sys_clock.time_since_epoch());
        return seconds.count();
    };
    auto get_mark_time_seconds = [] (MarkTime time) { 
        std::tm mark_time = { 0};
        mark_time.tm_year = time.year - 1900;
        mark_time.tm_mon = time.month - 1;
        mark_time.tm_mday = time.day;
        mark_time.tm_hour = time.hour - 1;
        mark_time.tm_min = time.minute;
        mark_time.tm_sec = time.second;
        auto tp = std::chrono::system_clock::from_time_t(std::mktime(&mark_time));
        auto converted_mark_time = std::chrono::time_point_cast<std::chrono::seconds>(tp);
        auto seconds = std::chrono::duration_cast<std::chrono::seconds>(converted_mark_time.time_since_epoch());
        std::chrono::time_point<std::chrono::system_clock> stampTime(seconds);
        std::time_t tmStampTime = std::chrono::system_clock::to_time_t(stampTime);
        std::cout << "setting time: " << std::ctime(&tmStampTime) << std::endl;            //设置时间
        return seconds.count();
    };
    MarkTime SettingMarkTime = { 2021, 10, 31, 1, 1, 1};                                    //设置的年月日时分
    auto epoch_time = std::chrono::system_clock::to_time_t(std::chrono::time_point<std::chrono::system_clock>{ });
    std::cout << "epoch: " << std::ctime(&epoch_time) << std::endl;                        //纪元时间
    auto today_time = std::chrono::system_clock::to_time_t(std::chrono::system_clock::now());
    std::cout << "today: " << std::ctime(&today_time) << std::endl;                        //系统当前时间
    auto mark_time = get_mark_time_seconds(SettingMarkTime);    
    std::cout << "settint time to epoch: " << mark_time  << "seconds" << std::endl;     //设置时间距纪元时间（秒）
    auto system_time =  get_current_seconds();                                            //系统当前时间距纪元时间（秒）
    std::cout << "today to epoch: " << system_time << "seconds" << std::endl;                    
    return 0;
}