I would like compare the two dates to get a time (Days, Hours, minutes and seconds) difference in TWIG
{% set todayDate = ( \"now\"| date(\"Y-m-d H:i:s\") )
Since you pass the enddate to your template, you should do this in your controller and pass the result to your template.
Here is the php code you could use:
$now = new DateTime('now');
$dateToCompare = new DateTime('your date');
$difference = $now->format('U') - $dateToCompare->format('U');
// or if your date to compare is in the future :
// $difference = $dateToCompare->format('U') - $now->format('U');
$time_diff = gmdate('H',$difference);
echo $time_diff;