PHP get start and end date of a week by weeknumber

Question

I've seen some variants on this question but I believe this one hasn't been answered yet.

I need to get the starting date and ending date of a week, chosen by year and week number (not a date)

example:

input:

getStartAndEndDate($week, $year); 

output:

$return[0] = $firstDay; $return[1] = $lastDay; 

The return value will be something like an array in which the first entry is the week starting date and the second being the ending date.

OPTIONAL: while we are at it, the date format needs to be Y-n-j (normal date format, no leading zeros.

I've tried editing existing functions that almost did what I wanted but I had no luck so far.

Please help me out, thanks in advance.

Answer 1

Using DateTime class:

function getStartAndEndDate($week, $year) {   $dto = new DateTime();   $dto->setISODate($year, $week);   $ret['week_start'] = $dto->format('Y-m-d');   $dto->modify('+6 days');   $ret['week_end'] = $dto->format('Y-m-d');   return $ret; }  $week_array = getStartAndEndDate(52,2013); print_r($week_array); 

Returns:

Array (     [week_start] => 2013-12-23     [week_end] => 2013-12-29 ) 

Explained:

• Create a new DateTime object which defaults to now()
• Call setISODate to change object to first day of $week of $year instead of now()
• Format date as 'Y-m-d' and put in $ret['week_start']
• Modify the object by adding 6 days, which will be the end of $week
• Format date as 'Y-m-d' and put in $ret['week_end']

A shorter version (works in >= php5.3):

function getStartAndEndDate($week, $year) {   $dto = new DateTime();   $ret['week_start'] = $dto->setISODate($year, $week)->format('Y-m-d');   $ret['week_end'] = $dto->modify('+6 days')->format('Y-m-d');   return $ret; } 

Could be shortened with class member access on instantiation in >= php5.4.