I need to determine if someones age birthday is within 120 days

I have to determin if a person is eligible based on them turning 65. I need to know if they are with in a window of 120 days from the first day of the month of them turning 65. This window is 120 days in the future or 120 days in the past from the first day of the month of their 65th birthday.

I am not sure how to come up with this. Here is what I have so far:

$bday = new DateTime('2.12.1945');

$today = new DateTime('2010-08-01 00:00:00'); // for testing purposes

$diff = $today->diff($bday);

printf('%d years, %d month, %d days', $diff->y, $diff->m, $diff->d);

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I am a bit lost so far.
semfreakAsked:
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becraigCommented:
<?php

     $now = time(); // or your date as well
     $your_date = strtotime("2010-01-01");
     $datediff = $now - $your_date;
     echo floor($datediff/(60*60*24));

?>

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This will give you the difference in days.

$datediff/60*60*24
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Ray PaseurCommented:
This and many other date/time concepts are documented here:
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_201-Handling-date-and-time-in-PHP-and-MySQL.html

Beware of doing arithmetic with date and time values.  Leap year and daylight savings time are a couple of things that can trip you up.  Whenever possible use the built-in PHP functions.
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Ray PaseurCommented:
This should help you get started.
http://iconoun.com/demo/temp_semfreak.php

<?php // demo/temp_semfreak.php
error_reporting(E_ALL);

// SEE http://www.experts-exchange.com/Programming/Languages/Scripting/PHP/Q_28520303.html
// This window is 120 days in the future
// or 120 days in the past from the first day
// of the month of their 65th birthday.

// USE THE URL GET ARGUMENT "d=" TO PROVIDE A BIRTHDATE
$d = !empty($_GET['d']) ? strtotime($_GET['d']) : 0;
if ($d)
{
    $alpha = date('Y-m-d', strtotime('TODAY - 120 days'));
    $omega = date('Y-m-d', strtotime('TODAY + 120 days'));
    $birth = date('Y-m-d', strtotime($_GET['d'] . ' + 65 years'));

    if ($birth < $alpha)
    {
        echo "BIRTHDAY " . $_GET['d'] . " HAS PASSED THE WINDOW OF ELIGIBILITY";
    }
    elseif ($birth > $omega)
    {
        echo "BIRTHDAY " . $_GET['d'] . " IS NOT ELIGIBLE YET";
    }
    else
    {
        echo "BIRTHDAY " . $_GET['d'] . " IS CURRENTLY ELIGIBLE";
    }
}

// CREATE THE FORM FOR THE INPUT BIRTHDAY
$form = <<<EOD
<form>
Birthday?
<input name="d" />
<input type="submit" value="Check" />
</form>
EOD;
echo $form;

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semfreakAuthor Commented:
Here is the revised code I am using to get me there:

// Example birthday
$dob = "2-12-1945";

function threeMonthsOut($birthdate) {

    return date("Y-m-d", strtotime("+3 months", strtotime($birthdate)));
}

function threeMonthsBack($birthdate) {

    return date("Y-m-d", strtotime("-3 months", strtotime($birthdate)));
}


//are you in your 65 year 120 + -  window?
$windowforward = threeMonthsOut($dob);
$windowBack = threeMonthsBack($dob);
$today = date("Y-m-d");

// YES or NO?

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Ray PaseurCommented:
I understood the window to be 120 days.  That is not the same as 3 months.  The term "month" is ambiguous, but in any case, three of them will never give you 120 days.
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semfreakAuthor Commented:
What Am I doing wrong. I am trying to pass $d with out using the form and I am not getting anytging back from $d:

$d = strtotime(1944-7-22);
echo $d;
//$d = !empty($_GET['d']) ? strtotime($_GET['d']) : 0;
if ($d)
{
    $alpha = date('Y-m-d', strtotime('TODAY - 120 days'));
    $omega = date('Y-m-d', strtotime('TODAY + 120 days'));
    $birth = date('Y-m-d', strtotime($_GET['d'] . ' + 65 years'));

    if ($birth < $alpha)
    {
        echo "BIRTHDAY " . $_GET['d'] . " HAS PASSED THE WINDOW OF ELIGIBILITY";
    }
    elseif ($birth > $omega)
    {
        echo "BIRTHDAY " . $_GET['d'] . " IS NOT ELIGIBLE YET";
    }
    else
    {
        echo "BIRTHDAY " . $_GET['d'] . " IS CURRENTLY ELIGIBLE";
    }
}

?>

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Ray PaseurCommented:
From the look of that last block of code, it seems like you might be new to PHP.  This article has some good "getting started" resources.
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_11769-And-by-the-way-I-am-new-to-PHP.html

Try it like this:
<?php // demo/temp_semfreak.php
error_reporting(E_ALL);

// SEE http://www.experts-exchange.com/Programming/Languages/Scripting/PHP/Q_28520303.html
// This window is 120 days in the future
// or 120 days in the past from the first day
// of the month of their 65th birthday.

// OVERWRITE THE $d VARIABLE
$d = '1944-7-22';
if ($d)
{
    $alpha = date('Y-m-d', strtotime('TODAY - 120 days'));
    $omega = date('Y-m-d', strtotime('TODAY + 120 days'));
    $birth = date('Y-m-d', strtotime($d . ' + 65 years'));

    if ($birth < $alpha)
    {
        echo "BIRTHDAY " . $d . " HAS PASSED THE WINDOW OF ELIGIBILITY";
    }
    elseif ($birth > $omega)
    {
        echo "BIRTHDAY " . $d . " IS NOT ELIGIBLE YET";
    }
    else
    {
        echo "BIRTHDAY " . $d . " IS CURRENTLY ELIGIBLE";
    }
}

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Ray PaseurCommented:
The correct answer with a tested-and-working code example is at #40328313
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