DateTimeImmutable
PHP Manual

DateTimeImmutable::setISODate

Sets the ISO date

Description

#[\NoDiscard] public DateTimeImmutable DateTimeImmutable::setISODate(int $year, int $week, int $dayOfWeek = 1)

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

Parameters

year

Year of the date.

week

Week of the date.

dayOfWeek

Offset from the first day of the week.

Return Values

Returns a new DateTimeImmutable object with the modified data.

Examples

Example #1 DateTimeImmutable::setISODate example

Object-oriented style

<?php

$date = new DateTimeImmutable();

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

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

The above example will output:

2008-01-07
2008-01-13

Procedural style

<?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";

The above example will output:

2008-01-07
2008-01-13

Example #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";

The above example will output:

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

Example #3 Finding the month a week is in

<?php

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

The above example will output:

3

See Also

  • DateTimeImmutable::setDate
  • DateTimeImmutable::setTime