Problem of counting the number of days since the beginning of the year

days.php

<?php

function countDays($dateInString) {

    // Write your code here

    // To print results to the standard output you can use print
    // Example:
    // print "Hello world!";
    $month = '';
    $day = '';
    $year = '';
    list($month, $day, $year) = split('[/.-]', $dateInString);
    if (checkdate($month, $day, $year)) {
    // valid date ...
      //print "Month: $month; Day: $day; Year: $year<br />\n";
      $startTimeStamp = strtotime($year . "/01/01");
      $endTimeStamp = strtotime($year . "/" . $month . "/" . $day);
      $timeDiff = abs($endTimeStamp - $startTimeStamp);
      $numberDays = $timeDiff/86400;  // 86400 seconds in one day
      // and you might want to convert to integer
      $numberDays = intval($numberDays);
      print $numberDays + 1;
    }
    else
    {
        print "Bad format";
    }
    
}

// Do NOT call the countDays function in the code
// you write. The system will call it automatically.

?>