获取当前时间字符串

std::string GetFormatTime()
{
	time_t currentTime;
	time(&currentTime);
	tm* t_tm = localtime(&currentTime);

	char formatTime[64] = {0};
	snprintf(formatTime, 64, "%04d-%02d-%02d %02d:%02d:%02d", 
							t_tm->tm_year + 1900,
							t_tm->tm_mon + 1,
							t_tm->tm_mday,
							t_tm->tm_hour,
							t_tm->tm_min,
							t_tm->tm_sec);
	return std::string(formatTime);
}

获取系统当前时间所需要的包

#include <time.h>
time_t currentTime;
time(&currentTime);