Subtracting A month from an arbitrary date in UNIX

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LEARN ABOUT PHP

datetime.setisodate

DATETIME.SETISODATE(3)							 1						    DATETIME.SETISODATE(3)

DateTime::setISODate - Sets the ISO date

       Object oriented style

SYNOPSIS

       public DateTime DateTime::setISODate (int  $year, int  $week, [int  $day = 1])

DESCRIPTION

       Procedural style
       DateTime date_isodate_set (DateTime  $object, int  $year, int  $week, [int  $day = 1])

	Set a date according to the ISO 8601 standard - using weeks and day offsets rather than specific dates.

PARAMETERS

	      o $object
		-Procedural style only: A DateTime object returned by date_create(3). The function modifies this object.

	      o $year
		- Year of the date.

	      o $week
		- Week of the date.

	      o $day
		- Offset from the first day of the week.

RETURN VALUES

	Returns the DateTime object for method chaining or FALSE on failure.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	| Changed  the return value on success from NULL to |
       |	| DateTime.					    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      DateTime.setISODate(3) example

	      Object oriented style

	      <?php
	      $date = new DateTime();

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

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

	      Procedural style

	      <?php
	      $date = date_create();

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

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

	      The above examples will output:

	      2008-01-07
	      2008-01-13

       Example #2

	      Values exceeding ranges are added to their parent values

	      <?php
	      $date = new DateTime();

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

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

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

	      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 DateTime();
	      $date->setISODate(2008, 14);
	      echo $date->format('n');
	      ?>

	      The above examples will output:

	      3

SEE ALSO 
DateTime.setDate(3), DateTime.setTime(3).
PHP Documentation Group 												    DATETIME.SETISODATE(3)

UNIX for Dummies Questions & Answers