function gps2unix($gpsTime)
{
// Add offset in seconds
$unixTime = $gpsTime + 315964800;
$nleaps = countleaps($gpsTime, 'gps2unix');
$unixTime = $unixTime - $nleaps;
if (isleap($gpsTime)) {
$unixTime = $unixTime + 0.5;
}
return $unixTime;
}
/**
* 指定した月の日数を返す
* @param int $year 西暦年
* @param int $month 月
* @return int 日数／FALSE:引数の異常
*/
function getDaysInMonth($year, $month)
{
static $days = array(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
if ($month < 1 || $month > 12) {
return FALSE;
}
$days[2] = isleap($year) ? 29 : 28;
//閏年の判定
return $days[$month];
}
function ydp_to_ymd($y, $d)
{
$md = array(array(0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365), array(0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366));
$d -= 1;
$m = trunc($d / 29);
if ($md[isleap($y) - 0][$m] > $d) {
$m -= 1;
}
$d = $d - $md[isleap($y) - 0][$m] + 1;
$m += 1;
return strcat($y, '-', str_pad_left($m, 2, '0'), '-', str_pad_left($d, 2, '0'));
}