Get difference between two dates in hours inside foreach loop - php

Question

What i want is to get difference between start and ends dates for user. there are 3 dates for a user which has start date and end dates. and all dates coming from database when i try i am unable to get desired result which is to get differences between dates such as 2 days, 3 days, 4 days from list of dates, and no error is showing.
My Code
<?php
$eid = $_SESSION['eid'];
$sql = "SELECT empid,ToDate,FromDate from tblleaves where empid=:eid";
$query = $dbh->prepare($sql);
$query->bindParam(':eid',$eid,PDO::PARAM_STR);
$query->execute();
$results = $query->fetchAll(PDO::FETCH_OBJ);
if($query->rowCount() > 0) {
foreach($results as $result)
{
$diff = date_diff($result->ToDate, $result->FromDate);
echo $diff->format("%h Hours");
htmlentities($result->FromDate));
}
}
?>
Database:

Answer 1

Is there anything outputted by your echo statement?
As fat as PHP is concerned the value returned by mysql/pdo is a string.
You have at least two options.
From the first example in the php docs for date_diff:
https://www.php.net/manual/en/datetime.diff.php
<?php
$datetime1 = new DateTime('2009-10-11');
$datetime2 = new DateTime('2009-10-13');
$interval = $datetime1->diff($datetime2);
echo $interval->format('%R%a days');
?>
Notice that they convert the date string to a date object first.
Then you can use date_diff or
$someDateObj->diff($dateObjTwo)
An alternative that works just as well is to select the date fields as a unix timestamp, then subtract both timestamps and convert the remaining absolute value to time in the format you wish. I may follow up with an example of that later.
edit - answering on my tiny phone so I missed the date format issue

Answer 2

Your date format in database is wrong, you have to fix that first by replacing the / with - eg.str_replace('/', '-', $result->ToDate))
then you have to convert the date to correct format like Y-m-d, after that you can check the difference, here is the solution for you
$to = date('Y-m-d', strtotime(str_replace('/', '-', $result->ToDate)));
$from = date('Y-m-d', strtotime(str_replace('/', '-', $result->FromDate)));
$datediff = strtotime($to) - strtotime($from);
echo abs(round($datediff / (60 * 60 * 24)));
if you want the difference in hours you can try the below code
$hourdiff = abs(round(($datediff)/3600, 1));
I hope this will help you

Answer 3

I ended up with this code this definitely help others.
$eid=$_SESSION['eid'];
$sql = "SELECT empid,ToDate,FromDate from tblleaves where empid=:eid";
$query = $dbh->prepare($sql);
$query->bindParam(':eid',$eid,PDO::PARAM_STR);
$query->execute();
$results=$query->fetchAll(PDO::FETCH_OBJ);
if($query->rowCount() > 0)
{
foreach($results as $result)
{
$to = date('Y-m-d', strtotime(str_replace('/', '-', $result->ToDate)));
$from = date('Y-m-d', strtotime(str_replace('/', '-', $result->FromDate)));
$hours = round(abs(strtotime($from) - strtotime($to))/60/60).'<br>';
$sum+=$hours;
}
echo '<h5>'.$sum.' Hours '.'</h5>';
}
?>