Answers for "php date by day number of year"

php date + one day

<?php
$stop_date = '2009-09-30 20:24:00';
echo 'date before day adding: ' . $stop_date; 
$stop_date = date('Y-m-d H:i:s', strtotime($stop_date . ' +1 day'));
echo 'date after adding 1 day: ' . $stop_date;
?>

php get date from day of year

// This should get you a DateTime object from the date and year.
function getDateFromDay($dayOfYear, $year) {
  $date = DateTime::createFromFormat('z Y', strval($dayOfYear) . ' ' . strval($year));
  return $date;
}

// This should get you the day of the year and the year in a string.
date('z Y', strtotime('21 oct 2012'));