smpp time parse

main.cc

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

uint64_t unixtime(const char* ts) {
  std::tm tm;
  tm.tm_year = (ts[0] - '0') * 10 + (ts[1] - '0');
  if (tm.tm_year < 70) tm.tm_year += 2000;
  tm.tm_mon = (ts[2] - '0') * 10 + (ts[3] - '0');
  tm.tm_mday = (ts[4] - '0') * 10 + (ts[5] - '0');
  tm.tm_hour = (ts[6] - '0') * 10 + (ts[7] - '0');
  tm.tm_min = (ts[8] - '0') * 10 + (ts[9] - '0');
  auto tt = std::mktime(&tm);
  return static_cast<uint64_t>(tt);
}

int main() {
  auto ts = ::unixtime("8009041337");
  std::cout << "TS: " << std::setfill('0') << std::setw(8) << ts;
  return 0;
}