core-bundle/src/Resources/contao/library/Contao/ZipReader.php
protected function decToUnix($intTime, $intDate)
	{
		return mktime
		(
			 ($intTime & 0xf800) >> 11,
			 ($intTime & 0x07e0) >>  5,
			 ($intTime & 0x001f) <<  1,
			 ($intDate & 0x01e0) >>  5,
			 ($intDate & 0x001f),
			(($intDate & 0xfe00) >>  9) + 1980
		);
	}
protected function decToUnix($intTime, $intDate)
	{
		return mktime
		(
			 ($intTime & 0xf800) >> 11,
			 ($intTime & 0x07e0) >>  5,
			 ($intTime & 0x001f) <<  1,
			 ($intDate & 0x01e0) >>  5,
			 ($intDate & 0x001f),
			(($intDate & 0xfe00) >>  9) + 1980
		);
	}
Calculate the Unix timestamp from two hexadecimal values

@param integer $intTime The time integer
@param integer $intDate The date integer

@return integer The Unix timestamp