C++ string to date (time_point)

strToTp.cpp

#include <iostream>
#include <chrono>
#include <sstream>
#include <iomanip>
#include <format>

using namespace std;
using namespace std::chrono;

system_clock::time_point strToTp(string dateString)
{
    tm tm = {};
    stringstream ss(dateString);
    ss >> get_time(&tm, "%d-%m-%Y");
    return system_clock::from_time_t(mktime(&tm));    
}

int main()
{

    // date in the format dd-mm-YYYY
    string dateString = "29-08-2023";
    time_point tpFromStr = strToTp(dateString);
    system_clock::time_point tpNow = system_clock::now();    
    cout << format("dateString is older than now: {}\n", tpFromStr < tpNow ? "true" : "false");

    return 0;
}