DateTime::setDate

date_date_set

(PHP 5 >= 5.2.0, PHP 7)

DateTime::setDate -- date_date_set — Sets the date

说明

面向对象风格

public DateTime DateTime::setDate ( int $year , int $month , int $day )

过程化风格

DateTime date_date_set ( DateTime $object , int $year , int $month , int $day )

Resets the current date of the DateTime object to a different date.

参数

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。

year

Year of the date.

month

Month of the date.

day

Day of the date.

返回值

返回被修改的 DateTime 对象， 或者在失败时返回 FALSE.

更新日志

版本 说明
5.3.0将返回值从NULL改为 DateTime 类型。

范例

Example #1 DateTime::setDate() example

面向对象风格

<?php
$date = new DateTime();
$date->setDate(2001, 2, 3);
echo $date->format('Y-m-d');
?>

过程化风格

<?php
$date = date_create();
date_date_set($date, 2001, 2, 3);
echo date_format($date, 'Y-m-d');
?>

以上例程会输出：

2001-02-03

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

<?php
$date = new DateTime();

$date->setDate(2001, 2, 28);
echo $date->format('Y-m-d') . "\n";

$date->setDate(2001, 2, 29);
echo $date->format('Y-m-d') . "\n";

$date->setDate(2001, 14, 3);
echo $date->format('Y-m-d') . "\n";
?>

以上例程会输出：

2001-02-28
2001-03-01
2002-02-03

参见

User Contributed Notes

kevin dot nadin at gmail dot com 05-Apr-2017 06:26
Correction on the previous comment :

Bug fixed in php 7.0.17 and 7.1.3, for the version 7.0.0 to 7.0.16 and 7.1.0 to 7.1.2, the bug is still present
kevin dot nadin at gmail dot com 05-Apr-2017 06:16
Be carreful about this bug in php 5.6 and lower (fixed in php 7.0 and higher) :

<?php
$date = new DateTime("first day of last month");
echo $date->format('Y-m-d');
echo  ' => ' ;
$date->setDate(2013, 2, 3);
echo $date->format('Y-m-d');
?>

Output <=5.6 : 2017-03-01 => 2013-02-01
Output >=7.0 : 2017-03-31 => 2013-02-03

Same goes for "Last day of last month", and the funny part, it will take the last day of the new month setted by setDate

Example with a Leap Year :
<?php
$date = new DateTime("last day of last month");
echo $date->format('Y-m-d');
echo  ' => ' ;
$date->setDate(2012, 2, 3);
echo $date->format('Y-m-d');
?>

Output <=5.6 : 2017-03-31 => 2012-02-29
Output >=7.0 : 2017-03-31 => 2012-02-03
remy215 at laposte dot net 12-Jan-2012 07:59
Be warned, DateTime::setDate() does not check for invalid input.

Illustration:
<?php
$dt = new DateTime();
$dt->setDate(2012, 11, 31); // returns DateTime object and not false although this date does not exist
echo $dt->format('Y-m-d'); // output: 2012-12-01
?>

No error was generated on entering a non existing date, php silently changed it.