[function] Calculate Due Dates

JdS · #1 30-Jul-2004, 05:51

Usage:
string calc_due_date( string date, string interval, int add [, string return_date_format] )

returns false on error.

PHP Code:


<?php
/**
 * @name calc_due_date()
 * @created February 21, 2003
 * @author J de Silva
 * @modified July 30, 2004
 * ------------------------------------------------------------------
 */
function calc_due_date( $date, $interval, $add, $return_date_format='Y-m-d' )
{
  $date  =  strtotime( $date );
  if( $date !== -1 )
  {
    $date  =  getdate( $date );
    switch( strtolower($interval) )
    {
      case  'month'  :  $date['mon']  +=  $add;  break;
      case  'day'    :  $date['mday'] +=  $add;  break;
      default        :  $date['year'] +=  $add;
    }
    return( date($return_date_format, mktime(0, 0, 0, $date['mon'], $date['mday'], $date['year'])) );
  }
  return( false );
}
?>

Want to discuss this PHP function? Your comments, corrections, suggestions are welcome here: How to add months to date.

JdS · #2 30-Jul-2004, 06:00

Due Date: 3 months

PHP Code:


<?php
// a sample date...
$date  =  '2004-03-20';

$due_date  =  calc_due_date( $date, 'month', 3 );
echo "<p>Due date for $date is: <b>$due_date</b></p>";
// returns
// <p>Due date for 2004-03-20 is <b>2004-06-20</b></p>
?>

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[function] Calculate Due Dates

Example code using the function: calc_due_dates()