DateTimeImmutable::sub

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

DateTimeImmutable::sub — Subtracts an amount of days, months, years, hours, minutes and seconds

说明

public DateTimeImmutable::sub(DateInterval $interval): DateTimeImmutable

Returns a new DateTimeImmutable object, with the specified DateInterval object subtracted from the specified DateTimeImmutable object.

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。
interval: A DateInterval object

返回值

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

范例

示例 #1 DateTimeImmutable::sub() example

面向对象风格


<?php
$date = new DateTimeImmutable('2000-01-20');
$newDate = $date->sub(new DateInterval('P10D'));
echo $newDate->format('Y-m-d') . "\n";
?>

以上例程会输出：

2000-01-10

示例 #2 Further DateTimeImmutable::sub() examples


<?php
$date = new DateTimeImmutable('2000-01-20');
$newDate = $date->sub(new DateInterval('PT10H30S'));
echo $newDate->format('Y-m-d H:i:s') . "\n";

$date = new DateTimeImmutable('2000-01-20');
$newDate = $date->sub(new DateInterval('P7Y5M4DT4H3M2S'));
echo $newDate->format('Y-m-d H:i:s') . "\n";
?>

以上例程会输出：

2000-01-19 13:59:30
1992-08-15 19:56:58

示例 #3 Beware when subtracting months


<?php
$date = new DateTimeImmutable('2001-04-30');
$interval = new DateInterval('P1M');

$newDate1 = $date->sub($interval);
echo $newDate1->format('Y-m-d') . "\n";

$newDate2 = $newDate1->sub($interval);
echo $newDate2->format('Y-m-d') . "\n";
?>

以上例程会输出：

2001-03-30
2001-03-02

参见

DateTimeImmutable::add() - Returns a new object, with added amount of days, months, years, hours, minutes and seconds
DateTimeImmutable::diff() - Returns the difference between two DateTime objects
DateTimeImmutable::modify() - Creates a new object with modified timestamp

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