c++获取当前时间的字符串

代码

void getNowTimePrefix(std::string& prefix)
{std::time_t nowTime;struct tm* p = new tm;std::time(&nowTime);localtime_s(p, &nowTime);int year = p->tm_year + 1900;int month = p->tm_mon + 1;int day = p->tm_mday;int hour = p->tm_hour;int minute = p->tm_min;int second = p->tm_sec;delete p;prefix = std::to_string(year)+ std::string(2 - std::to_string(month).length(), '0') + std::to_string(month)+ std::string(2 - std::to_string(day).length(), '0') + std::to_string(day)+ "_"+ std::string(2 - std::to_string(hour).length(), '0') + std::to_string(hour)+ std::string(2 - std::to_string(minute).length(), '0') + std::to_string(minute)+ std::string(2 - std::to_string(second).length(), '0') + std::to_string(second);
}

用法

#include<iostream>
using namespace std;int main()
{std::string nowTimePrefix;getNowTimePrefix(nowTimePrefix);cout << nowTimePrefix << endl;return 0;
}

结果