- time: documentation ( source)
- floor: documentation ( source)
- strtotime: documentation ( source)
<?php
$Draw_time = "29/01/2016 7pm";
$date = DateTime::createFromFormat("d/m/Y ha",$Draw_time);
$new_date = $date->format('Y-m-d H:i:s');
$seconds = strtotime($new_date) - time();
$days = floor($seconds / 86400);
$seconds %= 86400;
$hours = floor($seconds / 3600);
$seconds %= 3600;
$minutes = floor($seconds / 60);
$seconds %= 60;
echo "$days days and $hours hours and $minutes minutes and $seconds seconds";