In PHP, you can calculate the time difference between two dates using the DateTime class.

Here's a simple example:

Setting the Dates:

$date1 = new DateTime('2024-01-01 12:00:00');
$date2 = new DateTime('2024-01-02 18:30:00');

In this step, two DateTime objects, $date1 and $date2, are created. These objects represent the two dates for which you want to find the time difference. You should replace the date and time values in the DateTime constructor with your specific dates.

Calculating the Difference:

$interval = $date1->diff($date2);

The diff() method is used to calculate the difference between the two DateTime objects. The result is stored in the $interval variable, which is an instance of the DateInterval class.

echo "Time difference: " . $interval->format('%d days, %h hours, %i minutes, %s seconds');

The format() method is called on the $interval object to format and retrieve the difference in a human-readable format. The format string '%d days, %h hours, %i minutes, %s seconds' specifies how the difference should be displayed. The placeholders like %d, %h, %i, and %s represent days, hours, minutes, and seconds, respectively.

The final result is echoed to the screen, displaying the time difference between the two dates in the specified format.

Here is complete example:
<?php
// Set the two dates
$date1 = new DateTime('2024-01-01 12:00:00');
$date2 = new DateTime('2024-01-02 18:30:00');

// Calculate the difference
$interval = $date1->diff($date2);

// Output the difference
echo "Time difference: " . $interval->format('%d days, %h hours, %i minutes, %s seconds');
?>