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<?php $date = '2022-W10'; // 1. parce year & week from string preg_match('/(\d{4})-W(\d+)/', $date, $matches); $year = $matches[1]; $week_no = $matches[2]; printf('Year: %d, Week no.: %d' . PHP_EOL, $year, $week_no); // get date by year & week number $week_start = new DateTime(); $week_start->setISODate($year, $week_no); // get month $month = $week_start->format('n'); printf('Month: %d' . PHP_EOL, $month); // get quarter $quarter = ceil($month/3); printf('Quarter: %d' . PHP_EOL, $quarter);
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