Sets the ISO date

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- PHP Manual
- DateTimeImmutable
- Sets the ISO date

# DateTimeImmutable::setISODate

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

DateTimeImmutable::setISODate — Sets the ISO date

### Description

public DateTimeImmutable::setISODate(int `$year`, int `$week`, int `$dayOfWeek` = 1): DateTimeImmutable

Returns a new DateTimeImmutable object with the date set according to the ISO 8601 standard - using weeks and day offsets rather than specific dates.

### Parameters

`year`

  Year of the date.

`week`

  Week of the date.

`dayOfWeek`

  Offset from the first day of the week.

### Return Values

Returns a new DateTimeImmutable object with the modified data.

### Examples

Example #1 DateTimeImmutable::setISODate() example

Object-oriented style

    <?php
    $date = new DateTimeImmutable();

    $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

Example #2 Values exceeding ranges are added to their parent values

    <?php
    $date = new DateTimeImmutable();

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

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

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

The above example will output:

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

Example #3 Finding the month a week is in

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

The above examples will output:

    3

### See Also

- DateTimeImmutable::setDate() - Sets the date
- DateTimeImmutable::setTime() - Sets the time