#include "pch.h"

#include "PqUtils.h"

// From https://stackoverflow.com/a/40914871/946850:

int days_from_civil(int y, int m, int d) {

y -= m <= 2;

const int era = (y >= 0 ? y : y - 399) / 400;

const int yoe = static_cast<unsigned>(y - era * 400); // [0, 399]

const int doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + d - 1; // [0, 365]

const int doe = yoe * 365 + yoe / 4 - yoe / 100 + doy; // [0, 146096]

return era * 146097 + doe - 719468;

}

time_t tm_to_time_t(const tm& tm_) {

const time_t days = days_from_civil(tm_.tm_year + 1900, tm_.tm_mon + 1, tm_.tm_mday);

return days * 86400 + tm_.tm_hour * 60 * 60 + tm_.tm_min * 60 + tm_.tm_sec;

}