(PHP 5 >= 5.2.0)
DateTime::setDate -- date_date_set — Sets the date
面向对象风格
过程化风格
Resets the current date of the DateTime object to a different 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。
year
Year of the date.
month
Month of the date.
day
Day of the date.
返回被修改的 DateTime 对象， 或者在失败时返回 FALSE.
| 版本 | 说明 |
|---|---|
| 5.3.0 | 将返回值从NULL改为 DateTime 类型。 |
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
wkeevers96 at yahoo dot com (2012-03-19 17:44:26)
Date validity can be checked with a custom class.
remy215 at laposte dot net (2012-01-11 22:59:06)
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.