【C++】Linux下计算特定日期与纪元日期差值（秒）

绝地灬酷狼 2022-09-16 15:19 179阅读 0赞

# 0x00 前言 #

文章中的文字可能存在语法错误以及标点错误，请谅解；

如果在文章中发现代码错误或其它问题请告知，感谢！

# 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;
    }

运行结果：  
![在这里插入图片描述][da8fa755083a4a59a27ad6168b75d109.png_pic_center]

以上。

[da8fa755083a4a59a27ad6168b75d109.png_pic_center]: /images/20220828/42f583891e624292a949d5c15700dce5.png