DateTimeImmutable::setISODate

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

DateTimeImmutable::setISODate — Sets the ISO date

说明

public DateTimeImmutable::setISODate(int $year, int $week, int $dayOfWeek = 1): DateTimeImmutable

Returns a new DateTimeImmutable object with the date set according to the ISO 8601 standard - using weeks and day offsets rather than specific dates.

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.
week: Week of the date.
dayOfWeek: Offset from the first day of the week.

返回值

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

范例

示例 #1 DateTimeImmutable::setISODate() example

面向对象风格


<?php
$date = new DateTimeImmutable();

$date->setISODate(2008, 2);
echo $date->format('Y-m-d') . "\n";

$date->setISODate(2008, 2, 7);
echo $date->format('Y-m-d') . "\n";
?>

过程化风格


<?php
$date = date_create();

date_isodate_set($date, 2008, 2);
echo date_format($date, 'Y-m-d') . "\n";

date_isodate_set($date, 2008, 2, 7);
echo date_format($date, 'Y-m-d') . "\n";
?>

以上例程会输出：

2008-01-07
2008-01-13

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


<?php
$date = new DateTimeImmutable();

$newDate = $date->setISODate(2008, 2, 7);
echo $newDate->format('Y-m-d') . "\n";

$newDate = $date->setISODate(2008, 2, 8);
echo $newDate->format('Y-m-d') . "\n";

$newDate = $date->setISODate(2008, 53, 7);
echo $newDate->format('Y-m-d') . "\n";
?>

以上例程会输出：

2008-01-13
2008-01-14
2009-01-04

示例 #3 Finding the month a week is in


<?php
$date = new DateTimeImmutable();
$newDate = $date->setISODate(2008, 14);
echo $newDate->format('n');
?>

以上例程会输出：

参见

DateTimeImmutable::setDate() - Sets the date
DateTimeImmutable::setTime() - Sets the time

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