Calculating Age

[matfish]

Hi,

Im trying to find out how to calculate the correct age from a given date of birth. I did use just the years (this year 2006 - date pf birth year) but this is inaccurate as surely it should also go by day and month?

Anyone help?

Thanks

[hackerkts]

At the moment I could only thinks of a troublesome method.

First include this to your script
[code]$day = date('d'); // This will check the current date
$month = date('m'); // This will check the current month
$year = date('Y'); // This will check the current year[/code]

After that you just include a form that let the user choose their date of birth and use those informations above to calculate.

Example:
[code]$_POST['year'] -  $year[/code]
This will give you the year.

[brown2005]

<?php

function age($dob)
{

$date = strtotime($dob);

$today = strtotime(date("d/m/Y"));

echo floor(($today - $date) / 31556926);

}

age("30/03/1900"); //Displays 20

?>

[Barand]

Ummm, That would have been right in 1920. Unix time functions don't work on dates before '1970-01-01'

Try

[code]<?php
function age($dt)  {

$y1 = date('Y', strtotime($dt));
$y2 = date('Y');
$md1 = date('md', strtotime($dt));
$md2 = date('md');
return ($md2 < $md1) ? ($y2 - $y1 - 1) : ($y2 - $y1);
}

$dob = '1949-01-22';

echo age($dob);
?>[/code]

[brown2005]

well that wasnt my own code, it was the code someone else gave to me, so i will change it to your code..

SO NOT MY FAULT

[brown2005]

how would you add months on to it...

say like 18 years 4 months....

any ideas?

[zq29]

[quote author=Barand link=topic=101345.msg401042#msg401042 date=1153472554]
Ummm, That would have been right in 1920. Unix time functions don't work on dates before '1970-01-01'
[/quote][quote author=brown2005 link=topic=101345.msg401128#msg401128 date=1153484750]
well that wasnt my own code, it was the code someone else gave to me, so i will change it to your code..

SO NOT MY FAULT
[/quote]

That is a variation of some code I posted the other week, looking back on it, it's not the most ideal solution (there's a bug in there too I have noticed). But it does work on dates prior to the epoc on some installs. Negative timestamps are supported on a *NIX/PHP5 combo I believe...

[Barand]

[code]
function age($dt)  {
    $t = strtotime($dt);
   
$y1 = date('Y', $t);
$y2 = date('Y');
$md1 = date('md', $t);
$md2 = date('md');
if ($md2 < $md1) {
$yrs = ($y2 - $y1 - 1);
$mths = 12 + date('m') - date('m', $t);
}
else {
    $yrs = ($y2 - $y1);
    $mths = date('m') - date('m', $t);
}
return "$yrs years $mths months";
}
[/code]

[matfish]

Barands code:

[code]<?php
function age($dt)  {

$y1 = date('Y', strtotime($dt));
$y2 = date('Y');
$md1 = date('md', strtotime($dt));
$md2 = date('md');
return ($md2 < $md1) ? ($y2 - $y1 - 1) : ($y2 - $y1);
}

$dob = '1949-01-22';

echo age($dob);
?>[/code]

works a treat!

Many thanks!!!!

[Barand]

[quote=SA]That is a variation of some code I posted the other week, looking back on it, it's not the most ideal solution (there's a bug in there too I have noticed). But it does work on dates prior to the epoc on some installs. Negative timestamps are supported on a *NIX/PHP5 combo I believe...[/quote]

Looks as though it works even on windows so long at its year 1901+. Guess the earlier example using 1900 was just unlucky.