How to add 24 hours to a unix timestamp in php?

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The Unix timestamp is designed to track time as a running total of seconds from the Unix Epoch on January 1st, 1970 at UTC. To add 24 hours to a Unix timestamp we can use any of these methods:

Method 1: Convert 24 hours to seconds and add the result to current Unix time.

Program:

<?php

echo time() + (24*60*60);

?>
Output:
```
1588671070
```

Method 2: Since hours in a day vary in systems such as Daylight saving time (DST) from exactly 24 hours in a day. It’s better to use PHP strtotime() Function to properly account for these anomalies. Using strtotime to parse current DateTime and one day to timestamp

Program:

<?php

echo strtotime("now"), "\n";

echo strtotime('+1 day');

?>
Output:
```
1588584696
1588671096
```

Method 3: Using DateTime class we can achieve same result. First create a DateTime object with current timestamp and add interval of one day. P1D represents a Period of 1 Day interval to be added.

Program:

<?php  
  
// Get current time stamp 
$now = new DateTime(); 
$now->format('Y-m-d H:i:s');     
echo $now->getTimestamp(), "\n";    
  
// Add interval of P1D or Period of 1 Day 
$now->add(new DateInterval('P1D')); 
echo $now->getTimestamp(); 
  
?> 