How to get date n months before in Unix?

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LEARN ABOUT PHP

datetime.setdate

DATETIME.SETDATE(3)							 1						       DATETIME.SETDATE(3)

DateTime::setDate - Sets the date

       Object oriented style

SYNOPSIS

       public DateTime DateTime::setDate (int  $year, int  $month, int	$day)

DESCRIPTION

       Procedural style
       DateTime date_date_set (DateTime  $object, int  $year, int  $month, int	$day)

	Resets the current date of the DateTime object to a different date.

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 $month
		- Month of the date.

	      o $day
		- Day of the date.

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.setDate(3) example

	      Object oriented style

	      <?php
	      $date = new DateTime();
	      $date->setDate(2001, 2, 3);
	      echo $date->format('Y-m-d');
	      ?>

	      Procedural style

	      <?php
	      $date = date_create();
	      date_date_set($date, 2001, 2, 3);
	      echo date_format($date, 'Y-m-d');
	      ?>

	      The above examples will output:

	      2001-02-03

       Example #2

	      Values exceeding ranges are added to their parent values

	      <?php
	      $date = new DateTime();

	      $date->setDate(2001, 2, 28);
	      echo $date->format('Y-m-d') . "
";

	      $date->setDate(2001, 2, 29);
	      echo $date->format('Y-m-d') . "
";

	      $date->setDate(2001, 14, 3);
	      echo $date->format('Y-m-d') . "
";
	      ?>

	      The above example will output:

	      2001-02-28
	      2001-03-01
	      2002-02-03

SEE ALSO 
DateTime.setISODate(3), DateTime.setTime(3).
PHP Documentation Group 												       DATETIME.SETDATE(3)

Shell Programming and Scripting