【C++】 时间戳转换，获取当前时间与自定义时间进行判断

输入时间的格式与ubuntu下获取的时间格式一致。

例如：2024-06-26 12:00:00。

为了方便进行时间之间的比较，将时间转换成时间戳再进行判断。

代码

#include 
using namespace std;
time_t transferToTimeStamp(string str)
{
	// the format of time need to be as the same as the time in shell.
	// for example: "2024-06-26 12:00:00".
	tm tempTm;                                 // use tm structure.
	int year, month, day, hour, minute, second;// catch every time parameter.
	year   = atoi((str.substr(0, 4)).c_str());
	month  = atoi((str.substr(5, 2)).c_str());
	day    = atoi((str.substr(8, 2)).c_str());
	hour   = atoi((str.substr(11, 2)).c_str());
	minute = atoi((str.substr(14, 2)).c_str());
	second = atoi((str.substr(17, 2)).c_str());
	tempTm.tm_year  = year - 1900;              // the range of year in tm start from 1990, so need to reduce 1990.      
	tempTm.tm_mon   = month - 1;                 // the range of month in tm from 0 to 11, so need to reduce 1.
	tempTm.tm_mday  = day;                         
	tempTm.tm_hour  = hour;                        
	tempTm.tm_min   = minute;                       
	tempTm.tm_sec   = second;                       
	tempTm.tm_isdst = 0;                       // not daylight time.
	time_t timeStamp = mktime(&tempTm);        // transfer tm to time_t.
	return timeStamp;                                 
}
int main(void)
{
	// 1. get current timestamp.
	time_t now;                        
	int unixTime = (int)time(&now);
	// 2. set up your detect time and get timeStamp
	string detectTime = "2024-06-26 12:00:00";
	time_t t_strnowdate_time = transferToTimeStamp(detectTime);
	
	// 3. judge time
	if((int)t_strnowdate_time > (int)unixTime)
	{
		cout 
		cout