(PHP 5 >= 5.5.0, PHP 7, PHP 8)
DateTimeImmutable::setDate — Sets the date
Returns a new DateTimeImmutable object with the current date of the DateTimeImmutable object set to the given date.
object仅过程化风格：由 date_create() 返回的 DateTime 类型的对象。此函数会修改这个对象。
yearYear of the date.
monthMonth of the date.
dayDay of the date.
返回带有修改数据的新 DateTimeImmutable 对象。
示例 #1 DateTimeImmutable::setDate() example
面向对象风格
<?php
$date = new DateTimeImmutable();
$newDate = $date->setDate(2001, 2, 3);
echo $newDate->format('Y-m-d');
?>以上示例会输出：
2001-02-03
示例 #2 Values exceeding ranges are added to their parent values
<?php
$date = new DateTimeImmutable();
$newDate = $date->setDate(2001, 2, 28);
echo $newDate->format('Y-m-d') . "\n";
$newDate = $date->setDate(2001, 2, 29);
echo $newDate->format('Y-m-d') . "\n";
$newDate = $date->setDate(2001, 14, 3);
echo $newDate->format('Y-m-d') . "\n";
?>以上示例会输出：
2001-02-28 2001-03-01 2002-02-03