PHP - Comparing date, checking if within last hour

Question

I'm attempting to see if a time is within the last hour.

$unit_date = date($unit['last_accessed'], 'Y-m-d H:i:s');

$last_hour = date('Y-m-d H:i:s', strtotime('-1 hour')); 

if($unit_date >= $last_hour ){
    $connect = "<i class='fa fa-circle 2x' style='color:#2ECC71;'></i>";
} else {
    $connect = '';
}

As you can see I'm putting $unit['last_accessed'] into the correct format then comparing to an hour ago. If the time is within the last hour $connect is a font awesome circle (colored green), if it's not within the last hour it's empty, right now it's saying nothing is within the last hour which is false.

Answer 1

if(time() - strtotime($unit['last_accessed']) < 3601){

or

if(time() - strtotime($unit['last_accessed']) > 3599){

time() and strtotime() both use the same time base in seconds

if $unit['last_accessed'] is already an integer time variable then do not use strtotime().

Answer 2

DateTime solution

$firstDate = new \DateTime('2019-10-16 07:00:00');
$secondDate = new \DateTime('2019-10-17 07:00:00');

$diff = $firstDate->diff($secondDate);
$diffHours = $diff->h;

// diff in hours (don't worry about different years, it's taken into account)
$diffInHours = $diffHours + ($diff->days * 24);

// more than 1 hour diff
var_dump($diffInHours >= 1);

Origin similar answer: Calculate number of hours between 2 dates in PHP