How to get week dates from week number and year

In this tutorial I will show you how to get week dates from week number and year. We will calculate ISO week number (1-53) and represent the start of the week “Monday”.

There is a setISODate() method with DateTime extension that accepts the year (4-digit year) and ISO week number.

Example of get week dates from week number and year

function getWeekDates($week, $year) {
		$dates = array();
		
		$dateTime = new DateTime();
		$dateTime->setISODate($year, $week);
		
		$dates[] = $dateTime->format('Y-m-d');
		for($i=0; $i<6; $i++){ $dates[] = $dateTime->modify("+1 days")->format('Y-m-d');
		}
		
		return $dates;
    }

$week=18;
$year=2018;
$weekDates = getWeekDates($week, $year);
print_r($weekDates);

The output of above code is following:

Array
(
    [0] => 2018-04-30
    [1] => 2018-05-01
    [2] => 2018-05-02
    [3] => 2018-05-03
    [4] => 2018-05-04
    [5] => 2018-05-05
    [6] => 2018-05-06
)