Convert MS-DOS datetime (4 byte word) to UNIX time in PHP

msdostounixtime.php

/** Converts DOS time to Unix time */
function dosToUnixTime($dosTime) {
  $date = mktime(
    (($dosTime >> 11) & 0x1f), // hours
    (($dosTime >> 5) & 0x3f),  // minutes
    (($dosTime << 1) & 0x3e),  // seconds
    ((($dosTime >> 21) & 0x0f) - 1),   // month
    (($dosTime >> 16) & 0x1f),         // day
    ((($dosTime >> 25) & 0x7f) + 1980) // year
  );
return $date;
}