What are the potential pitfalls of manually calculating the calendar week in PHP?

One potential pitfall of manually calculating the calendar week in PHP is the risk of inaccuracies due to differences in how weeks are defined across different locales or systems. To avoid this issue, it is recommended to use PHP's built-in functions like `date("W")` to accurately determine the calendar week based on the ISO-8601 standard. 

// Get the current calendar week using PHP's built-in function
$calendarWeek = date("W");
echo "Current calendar week: " . $calendarWeek;

Keywords

date strtotime calendar week week number date functions

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