Sets the ISO date

# DateTimeImmutable::setISODate

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

DateTimeImmutable::setISODate — Sets the ISO date

### 说明

#[\NoDiscard(message: "as DateTimeImmutable::setISODate() does not modify the object itself")]
public function 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.

### 参数

`year`

  Year of the date.

`week`

  Week of the date.

`dayOfWeek`

  Offset from the first day of the week.

### 返回值

返回带有修改数据的新 DateTimeImmutable 对象。

### 示例

示例 #1 DateTimeImmutable::setISODate() example

面向对象风格

    <?php

    $date = new DateTimeImmutable();

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

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

以上示例会输出：

    2008-01-07
    2008-01-13

过程化风格

    <?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";

以上示例会输出：

    2008-01-07
    2008-01-13

示例 #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";

以上示例会输出：

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

示例 #3 Finding the month a week is in

    <?php

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

以上示例会输出：

    3

### 参见

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

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