How does the issue of date calculation in PHP relate to the concept of system time and time zones?

When calculating dates in PHP, it's important to consider the system time and time zones to ensure accurate results. This is because PHP's date functions rely on the server's system time and default time zone settings, which may not always align with the desired time zone. To resolve this issue, you can explicitly set the time zone using the `date_default_timezone_set()` function before performing any date calculations. 

// Set the desired time zone
date_default_timezone_set('America/New_York');

// Perform date calculations
$today = date('Y-m-d');
$nextWeek = date('Y-m-d', strtotime('+1 week'));

echo "Today's date: $today\n";
echo "Next week's date: $nextWeek\n";

Keywords

PHP date calculation system time time zones functions

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