PHP countdown timer using 'd-m-Y H:i:s' timestamp - php

Question

Im trying to create a timer that for 1 hour from a timestamp it shows a count down then after that shows a form button but I can't get it to work, I have tried multiple methods I found online but they either display the wrong time, or never show the form. Here is what I have so far:
while($row2 = $result2->fetch_assoc()) {
$timestamp = $row2['timestamp'];
$work_id = $row2['work_id'];
$current_time = date("Y-m-d H:i:s");
$ready_time = date("Y-m-d H:i:s", strtotime($timestamp)+3600);
if($current_time > $ready_time){?>
<form action="" method="POST" onsubmit="return confirm('Are you sure?');">
<input type="hidden" value="<?echo $work_id;?>" name="work_id">
<input type="submit" name="submit" value="Complete Workorder">
</form>
?
}else{
$time1 = new DateTime($current_time);
$time2 = new DateTime($timestamp);
$interval = $time1->diff($time2);
echo $interval->d ." Days ". $interval->h . " Hours, " . $interval->i." Mintues, ".$interval->s." seconds";
}
}

Answer 1

You can calculate the time left in your sql:
SELECT work_id, TIMESTAMPDIFF(SECOND,CURRENT_TIMESTAMP(),`timestamp`) AS timeleft
FROM tablename
Then check that value in your php:
$timeleft = $row2['timeleft'];
$work_id = $row2['work_id'];
if($timeleft >=0): ?>
<form action="" method="POST" onsubmit="return confirm('Are you sure?');">
<input type="hidden" value="<?echo $work_id;?>" name="work_id">
<input type="submit" name="submit" value="Complete Workorder">
</form>
<?php else: ?>
<p>You need to wait <?php echo $timeleft;?> seconds</p>
<?php endif;
If you want to chow a countdown that actually updates without a refresh, you will need to use javascript, in place of <p>You need to wait <?php echo $timeleft;?> seconds</p>