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:
Approach 1: Direct Addition of Seconds
Convert 24 hours to seconds and add the result to the current Unix time.
Example: In this example, involves directly adding seconds (24 hours) to the Unix timestamp.
<?php
echo time() + (24*60*60);
?>
Output
1721795431
Approach 2: Using strtotime() Function
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() function to parse current DateTime and one day to timestamp.
Example: In this example, leverages the strtotime function to add time.
<?php
echo strtotime("now"), "\n";
echo strtotime('+1 day');
?>
Output
1721709116 1721795516
Approach 3: Using DateTime Class
We create a DateTime object with current timestamp and add interval of one day. P1D represents a Period of 1 Day interval to be added.
Example: In this example, uses PHP's DateTime and DateInterval classes, which offer more flexibility and readability.
<?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
1721709230 1721795630
