php - Check if date has past other date don't work in certain situations

I have done research on how to figure out how I can use a if else statement to determine if a certain date has past another date or not but I notice this script works how it should work but if the day is a certain number for example 2 in the $present_time variable then it gives out the right output which is the else statement

This works

INPUT

<?php

$time_format = 'n-j-Y g:i A';
$time_zone = 'America/phoenix';

$date = DateTime::createFromFormat($time_format, '9-2-2021 11:28 AM', new DateTimeZone($time_zone));
$present_time = $date->format($time_format);

$date = DateTime::createFromFormat($time_format, '9-21-2021 9:57 PM', new DateTimeZone($time_zone));
$end_time = $date->format($time_format);

if($present_time > $end_time) {
    
   echo 'Present time has pass the end time.';

} 

else{
    
     echo 'Present time has not pass the end time.';

}

?>
Copy code

OUTPUT

Present time has not pass the end time.

but if I change the $present_time variables day to a 3 then I get an unexpected output which is the if statement and I should not get the else statement to show because the $end_time obviously has a later date.

INPUT

<?php

$time_format = 'n-j-Y g:i A';
$time_zone = 'America/phoenix';

$date = DateTime::createFromFormat($time_format, '9-3-2021 11:28 AM', new DateTimeZone($time_zone));
$present_time = $date->format($time_format);

$date = DateTime::createFromFormat($time_format, '9-21-2021 9:57 PM', new DateTimeZone($time_zone));
$end_time = $date->format($time_format);

if($present_time > $end_time) {
    
   echo 'Present time has pass the end time.';

} 

else{
    
    echo 'Present time has not pass the end time.';

}

?> 
Copy code

OUTPUT

Present time has pass the end time.

So how can I get this to work properly to show the correct condition properly in these situations.

I got this method based on this tutorial

https://write.corbpie.com/php-check-if-current-date-time-has-passed-a-set-date-time/

but I need to use the hyphen character so that is why it looks a little different from that tutorial.

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