OLETIME to ...time...

#include <iostream>
#include <iomanip>
#include <vector>
#include <cstdint>
#include <ctime>

using namespace std;

int main() {
    vector<uint8_t> bytes = { 190, 110, 116, 207, 178, 140, 229, 64 };
    int64_t l = 0;

    for (size_t i = 0; i < bytes.size(); ++i) {
        l |= static_cast<int64_t>(bytes[i]) << (i * 8);
    }

    double d = *reinterpret_cast<double*>(&l);
    time_t t = static_cast<time_t>(d);
    tm* dt = localtime(&t);

    //cout << put_time(dt, "%Y-%m-%d %H:%M:%S") << endl;
    cout << dt << endl;

    return 0;
}