How can PHP beginners efficiently handle date manipulation tasks like converting a day number into a specific date format?

When handling date manipulation tasks in PHP, beginners can efficiently convert a day number into a specific date format by using the date() function along with mktime() to create a timestamp from the day number. This timestamp can then be formatted using the date() function to display the date in the desired format.

$dayNumber = 150; // Example day number
$timestamp = mktime(0, 0, 0, 1, $dayNumber, date("Y")); // Create timestamp from day number
$formattedDate = date("Y-m-d", $timestamp); // Format timestamp into desired date format
echo $formattedDate; // Output: 2023-05-30