how can i calculate date not less than 18

Question

I am trying to find the date not less than 18 years, I tried this following code, but its not working for me.

// validate birthday
function validateAge($then, $min)
{
    // $then will first be a string-date
    $then = strtotime($then);

    echo "<br>";
    echo 'test1-';
    var_dump( $then );

    exit;
    //The age to be over, over +18
    $min = strtotime('+18 years', $then);

    if(time() < $min)  {
        die('Not 18'); 
    }
}

$res = validateAge('2016-02-29', $min = 18);

var_dump($res);

I fyou see the above question, you can see that, date is not valid, even if i pass the wrong date, its shows the $then = strtotime($then);

var_dump($then) show the int

my question is, how its printing the timestamp, event if we passing the invalid date.

If you look at the lines you've written, you'll find out why it doesn't work, easily. — revo, May 13 '16 at 08:21
Possible duplicate of [Calculating number of years between 2 dates in PHP](http://stackoverflow.com/questions/5387166/calculating-number-of-years-between-2-dates-in-php) — Marius, May 13 '16 at 08:25

score 1 · Accepted Answer · edited May 13 '16 at 09:07

1

Your logic is correct. Remove die, exit and echo which is not needed

function validateAge($then, $min)
{
    // $then will first be a string-date
    $then = strtotime($then);

    //The age to be more then min years
    $min = strtotime('+'. $min . ' years', $then);

    return time() > $min;
}

$res = validateAge('2016-02-29', $min = 18);
echo $res ? 'O\'key' : "Not $min years";

demo

edited May 13 '16 at 09:07

Saurabh

776
1
5
15

answered May 13 '16 at 08:18

splash58

26,043
3
22
34

I probably searched too complicated. :s – Alexis May 13 '16 at 08:24
I downvoted because this is not a question to be answered. Instead, it's better to vote for close. – revo May 13 '16 at 08:42
@revo it's your right, but i think that in this case more orrect to downvote question and vote to close it. While rewardeding an answer is independent process – splash58 May 13 '16 at 08:56
@splash58 It's community right and yes, I downvoted both. – revo May 13 '16 at 08:59
even if i pass the wrong date, its shows the $then = strtotime($then); var_dump($then) show the int my question is, how its printing the timestamp, event if we passing the invalid date. – user3929758 May 13 '16 at 09:33

score 0 · Answer 2 · answered May 13 '16 at 08:22

Try maybe something like this

function compareAge($date,$min=18)
{
    $strdate = strtotime($date);
    $curdate = strtotime("today");
    $datefin=date("Ymd",$curdate)-date("Ymd",$strdate);
    $age=substr($datefin,0,strlen($datefin)-4);
    return $age>=$min;
}

var_dump(compareAge("2013-05-13"));

DEMO

score 0 · Answer 3 · edited May 23 '17 at 11:58

0

you could use this method:

public function validateAge($then)
{
  $then= date_create($then);
  $now = date_create("now");

  $diff = $now->diff($then);

  if ($diff->y > 18)
  {
  die('not 18');
  }

}

Duplicate: Calculating number of years between 2 dates in PHP

edited May 23 '17 at 11:58

Community

1
1

answered May 13 '16 at 08:23

Marius

399
2
14

score 0 · Answer 4 · answered May 13 '16 at 08:23

use the datetime object to save all sorts of pain. Its so much more simple.

function validateAge(DateTime $then, $min = 18)
{
    $now = new DateTime();

    $minimum = clone($now);         // you could just modify now, but this is simpler to explain
    $minimum->modify("-$min years");


    if($then < $minimum) {
        return false;
    } 

    return true;
}

echo validateAge(new DateTime('1-1-1997')) ? 'true' : 'false';  // returns false
echo validateAge(new DateTime('1-1-1999')) ? 'true' : 'false';  // returns true

see example

score 0 · Answer 5 · answered May 13 '16 at 08:36

Wow, so many try-hards. In case you like is simple:

<?php
function validateAge($date) {
    return date_create('18 years ago') > date_create($date);
}

var_dump(
    validateAge('2010-10-05'),
    validateAge('1992-09-02')
);

OUTPUT

bool(false)
bool(true)

Play with me on 3v4l.org

Edit: Also works with the $min parameter:

<?php
function validateAge($date, $min) {
    return date_create("$min years ago") > date_create($date);
}

var_dump(
    validateAge('2010-10-05', 18),
    validateAge('1992-09-02', 18)
);

how can i calculate date not less than 18

5 Answers5