PHP get start and end date of a week by weeknumber

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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.

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