Working with Dates for Weekly Calendar

gistfile1.txt

$year = date('Y');
$week_no = date('W');

$week_start = new DateTime();
$week_start->setISODate($year, $week_no);

echo $week_start->format('l jS F (Y-m-d)'); // Monday for the current week

// Gets the week range for given date YYYY-MM-DD
function rangeWeek($datestr) {
    date_default_timezone_set(date_default_timezone_get());
    $dt = strtotime($datestr);
    $res['start'] = date('N', $dt) == 1 ? date('Y-m-d', $dt) : date('Y-m-d', strtotime('last monday', $dt));
    $res['end'] = date('N', $dt) == 7 ? date('Y-m-d', $dt) : date('Y-m-d', strtotime('next sunday', $dt));
    return $res;
}