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DateTimeImmutable::modify

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

DateTimeImmutable::modify — Creates a new object with modified timestamp

说明

public DateTimeImmutable::modify(string $modifier): DateTimeImmutable|false

Creates a new DateTimeImmutable object with modified timestamp. The original object is not modified.

参数

modifier: 日期/时间字符串。正确格式的说明详见日期与时间格式。

返回值

Returns a new modified DateTimeImmutable object 或者在失败时返回 false.

错误／异常

If an invalid Date/Time string is passed, DateMalformedStringException is thrown. Previous to PHP 8.3, this was a warning.

更新日志

版本	说明
8.3.0	Now throws DateMalformedStringException if an invalid string is passed, instead of a warning.

示例

示例 #1 DateTimeImmutable::modify() example

面向对象风格

<?php
$date = new DateTimeImmutable('2006-12-12');
$newDate = $date->modify('+1 day');
echo $newDate->format('Y-m-d');
?>

以上示例会输出：

2006-12-13

示例 #2 Beware when adding or subtracting months

<?php
$date = new DateTimeImmutable('2000-12-31');

$newDate1 = $date->modify('+1 month');
echo $newDate1->format('Y-m-d') . "\n";

$newDate2 = $newDate1->modify('+1 month');
echo $newDate2->format('Y-m-d') . "\n";
?>

以上示例会输出：

2001-01-31
2001-03-03

参见

DateTimeImmutable::add() - Returns a new object, with added amount of days, months, years, hours, minutes and seconds
DateTimeImmutable::sub() - Subtracts an amount of days, months, years, hours, minutes and seconds
DateTimeImmutable::setDate() - Sets the date
DateTimeImmutable::setISODate() - Sets the ISO date
DateTimeImmutable::setTime() - Sets the time
DateTimeImmutable::setTimestamp() - Sets the date and time based on a Unix timestamp

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User Contributed Notes 1 note

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dmytro dot sokil at gmail dot com ¶

6 years ago


To modify milliseconds and microseconds use next formats:

<?php
$a = new \DateTimeImmutable('2018-01-01 00:00:00.000'); 
$b = $a->modify('9 msec'); 
var_dump($b->format('Y-m-d H:i:s.u'));
?>

Returns string(26) "2018-01-01 00:00:00.009000"

<?php
$a = new \DateTimeImmutable('2018-01-01 00:00:00.000'); 
$b = $a->modify('9 usec'); 
var_dump($b->format('Y-m-d H:i:s.u'));
?>

Returns "2018-01-01 00:00:00.000009"

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