How can PHP be used to calculate the day of the week and calendar week from a given date?

To calculate the day of the week and calendar week from a given date in PHP, you can use the `DateTime` class along with the `format` method to extract the day of the week and `W` format character to get the calendar week. 

$date = '2022-01-15';
$dateTime = new DateTime($date);
$dayOfWeek = $dateTime->format('l');
$calendarWeek = $dateTime->format('W');

echo "Day of the week: $dayOfWeek\n";
echo "Calendar week: $calendarWeek\n";

Keywords

PHP date strtotime day of the week calendar week

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