date_isodate_setdate

The ISO Date Format PHP or DateTime::setISODate function sets the date according to ISO 8601 standard - using weeks and day offsets rather than specific dates. It returns the modified DateTime. 

Description of ISO Date Format in PHP

public DateTime DateTime::setISODate ( int $year, int $week [, int $day ] )

DateTime date_isodate_set ( DateTime $object, int $year, int $week [, int $day ] )

Parameters of date_isodate_setdate() in PHP

object - Procedural style only: A DateTime object returned by date_create()

year - Year of the date.

week - Week of the date.

day - Offset from the first day of the week.


Example: Finding the date from a week number and day offset

<?php
date_default_timezone_set('India/Kolkata');

$datetime = new DateTime();

// Offset from start of week 2 (7) = 5
$datetime->setISODate(2009, 2, 5); // Day 5 of week 2 of 2009 is the 9th of January. 

// Offset from start of week 2 (7) = 10
$datetime->setISODate(2009, 2, 10); // Day 10 of week 2 of 2009 is the 14th of January.
?>

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