PHP | date_isodate_set() Function

The date_isodate_set() function is an inbuilt function in PHP which is used to sets the ISO (International Organization for Standardization ) date. This function set the date according to the ISO 8601 standard, using weeks and day offsets rather than specific dates.

Syntax:

• Procedural style:

  date_isodate_set ( $object, $year, $week, $day )

• Object oriented style:

  DateTime::setISODate ( $year, $week, $day )

Parameters: This function accepts four parameters as mentioned above and described below:

• $object: This parameter is used in procedural style only. This parameter is created by date_create() function. The function modifies this object.
• $year: This parameter is used to set year of the date.
• $week:This parameter set the Week of the date.
• $day: This parameter set offset from the first day of week.

Return Value: This function returns the DateTime object for method chaining on success or False on failure.

Below programs illustrate the date_isodate_set() function in PHP:

Program 1:

<?php
$date = date_create();

date_isodate_set($date, 2018, 9);
echo date_format($date, 'Y-m-d') . "\n";

date_isodate_set($date, 2018, 8, 17);
echo date_format($date, 'Y-m-d') . "\n";

date_isodate_set($date, 2018, 12, 23);
echo date_format($date, 'Y-m-d') . "\n";

date_isodate_set($date, 2015, 8, 24);
echo date_format($date, 'Y-m-d');
?>

Output:

2018-02-26
2018-03-07
2018-04-10
2015-03-11

Program 2:

<?php
$date = new DateTime();

$date->setISODate(12, 05, 2018);
echo $date->format('d-m-Y') . "\n";

$date->setISODate(2018, 2, 27);
echo $date->format('Y-m-d') . "\n";
?>

Output:

08-08-0017
2018-02-03

Reference: http://php.net/manual/en/datetime.setisodate.php