12.
How many constants does the DateTime class have?

13.
Which method is simply an object-oriented version of date()?

14.
Which of the following is the right way to use the DateTime class?

15.
What will be the output of the following PHP code if date is 24/02/2008?
<?php
$date = new DateTime();
echo $date->format('l,F,js,Y')
?>