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

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();
  
  ?>
• Output:

  1588584729
  1588671129