(PHP 5 >= 5.5.0, PHP 7, PHP 8)
DateTimeImmutable::setISODate — Sets the ISO date
Returns a new DateTimeImmutable object with the date set according to the ISO 8601 standard - using weeks and day offsets rather than specific dates.
yearYear of the date.
weekWeek of the date.
dayOfWeekOffset from the first day of the week.
返回带有修改数据的新 DateTimeImmutable 对象。
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";
?>以上示例会输出：
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";
?>以上示例会输出：
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');
?>以上示例会输出：
3