PHP How to find the time elapsed since a date time?

You can use the DateTime class in PHP to find the time elapsed since a specific date time. Here is an example of how you can do this:

<?php

$start = new DateTime('2022-10-01 10:00:00');
$now = new DateTime();
$interval = $now->diff($start);
echo $interval->format('%y years %m months %d days %h hours %i minutes %s seconds');

Watch a course Learn object oriented PHP

In this example, a new DateTime object is created for the date and time '2022-10-01 10:00:00'. Another DateTime object is created for the current date and time using the DateTime() constructor without any arguments. The diff() method is then used to find the difference between the two DateTime objects, which returns a DateInterval object. The format() method is used to format the interval into a human-readable string, using the format string '%y years %m months %d days %h hours %i minutes %s seconds'.

You can also simply use the time() function to get the time elapsed in seconds and then use various mathematical operations to get the elapsed time in years, months, days, hours, minutes and seconds.