PHPexcel 对时间的处理

//excel日期转换函数function excelTime($date, $time = false) { if(function_exists('GregorianToJD')){  if (is_numeric( $date )) {   $jd = GregorianToJD( 1, 1, 1970 );   $gregorian = JDToGregorian( $jd + intval ( $date ) - 25569 );   $date = explode( '/', $gregorian );   $date_str = str_pad( $date [2], 4, '0', STR_PAD_LEFT )       ."-". str_pad( $date [0], 2, '0', STR_PAD_LEFT )       ."-". str_pad( $date [1], 2, '0', STR_PAD_LEFT )       . ($time ? " 00:00:00" : '');   return $date_str;  } }else{  $date=$date>25568?$date+1:25569;  /*There was a bug if Converting date before 1-1-1970 (tstamp 0)*/  $ofs=(70 * 365 + 17+2) * 86400;  $date =  date("Y-m-d",($date * 86400) - $ofs).($time ? " 00:00:00" : ''); } return $date;}