DateTime::setISODate

(PHP 5 >= 5.2.0, PHP 7)

Sets the ISO date

public DateTime DateTime::setISODate ( int $year, int $week [, int $day = 1 ] )

Object oriented style

Procedural style

DateTime date_isodate_set ( DateTime $object , int $year , int $week [, int $day = 1 ] )

Set a date according to the ISO 8601 standard - using weeks and day offsets rather than specific dates.

Parameters:

object

Procedural style only: A DateTime object returned by date_create(). The function modifies this object.

year

Year of the date.

week

Week of the date.

day

Offset from the first day of the week.

Returns:

Returns the DateTime object for method chaining or FALSE on failure.

Changelog:

5.3.0

Changed the return value on success from NULL to DateTime.

Examples:

DateTime::setISODate() example

Object oriented style

<?php
$date = new DateTime();

$date->setISODate(2008, 2);
echo $date->format('Y-m-d') . "\n";

$date->setISODate(2008, 2, 7);
echo $date->format('Y-m-d') . "\n";
?>

Procedural style

<?php
$date = date_create();

date_isodate_set($date, 2008, 2);
echo date_format($date, 'Y-m-d') . "\n";

date_isodate_set($date, 2008, 2, 7);
echo date_format($date, 'Y-m-d') . "\n";
?>

The above examples will output:

2008-01-07
2008-01-13

Values exceeding ranges are added to their parent values

<?php
$date = new DateTime();

$date->setISODate(2008, 2, 7);
echo $date->format('Y-m-d') . "\n";

$date->setISODate(2008, 2, 8);
echo $date->format('Y-m-d') . "\n";

$date->setISODate(2008, 53, 7);
echo $date->format('Y-m-d') . "\n";
?>

The above example will output:

2008-01-13
2008-01-14
2009-01-04

Finding the month a week is in

<?php
$date = new DateTime();
$date->setISODate(2008, 14);
echo $date->format('n');
?>

The above examples will output: