Why can't I access DateTime->date in PHP's DateTime class?

Question

Using the DateTime class, if I try to run the following code:

$mydate = new DateTime();
echo $mydate->date;

I'll get back this error message

Notice: Undefined property: DateTime::$date...

Which doesn't make sense because when running var_dump() on the variable $mydate, it clearly shows that this property exists and is publicly accessible:

var_dump($mydate);

object(DateTime)[1]
  public 'date' => string '2012-12-29 17:19:25' (length=19)
  public 'timezone_type' => int 3
  public 'timezone' => string 'UTC' (length=3)

Is this a bug within PHP or am I doing something wrong? I'm using PHP 5.4.3.

Good question. I thought for a moment that I didn't understand...anything. — regularmike
– regularmike, Commented Oct 15, 2015 at 16:59

jeremy · Accepted Answer · 2012-12-29 17:54:36Z

171

This is a known issue.

Date being available is actually a side-effect of support for var_dump() here – [email protected]

For some reason, you're not supposed to be able to access the property but var_dump shows it anyways. If you really want to get the date in that format, use the DateTime::format() function.

echo $mydate->format('Y-m-d H:i:s');

edited Dec 29, 2012 at 17:54

answered Dec 29, 2012 at 17:42

jeremy

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2 Comments

Megan Caithlyn Over a year ago

Why wouldn't one want this exact format? It is the same format as MySQL has for dates.

AndyGaskell Over a year ago

This is the same if using var_dump or print_r.

hek2mgl · Accepted Answer · 2020-11-22 22:36:47Z

19

Update: The behaviour has changed in PHP7.3, the original answer doesn't work anymore. To get the same results with all PHP versions, incl. >=7.3, you can use the following code:

$dt = new DateTime();
$date = $dt->format('Y-m-d\TH:i:s.v');

For the record, the original answer:

Besides calling DateTime::format() you can access the property using reflection:

<?php

$dt = new DateTime();
$o = new ReflectionObject($dt);
$p = $o->getProperty('date');
$date = $p->getValue($dt);

This is slightly faster than using format() because format() formats a timestring that has already been formatted. Especially if you do it many times in a loop.

However this is not a documented behaviour of PHP, it may change at any time.

edited Nov 22, 2020 at 22:36

answered Dec 29, 2012 at 17:44

hek2mgl

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3 Comments

TechCare99 Over a year ago

How this stopped working in PHP 7.4? 7.2 version sandbox.onlinephpfunctions.com/code/… 7.4 - Error sandbox.onlinephpfunctions.com/code/…

hek2mgl Over a year ago

@TechCare99 :) I think it should never worked like this, it was a hack. Need to check 7.4 for an alternative, not doing much php nowadays but will check it. Thanks for letting me know!

hek2mgl Over a year ago

Updated to work with all PHP versions

filipe · Accepted Answer · 2019-04-10 05:58:46Z

5

The date property of DateTime is protected.

You can display the date with format function.

<?php

try {
    $time = new DateTime();
    echo($time->format("Y-m-d H:i:s"));
} catch (Exception $e) {
}

Or you can convert to array:

<?php

try {
    $time = (array) new DateTime();
    var_dump($time["date"]);
} catch (Exception $e) {
}

answered Apr 10, 2019 at 5:58

filipe

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2 Comments

filipe Over a year ago

He wanted to know why couldn't he access the date property of DateTime object... Where do you see he wanted to format a stored Datetime values ? "Y-m-d H:i:s" is the format in witch the date is by default !

Jeffz Over a year ago

Object to array conversion - as you suggest - is probably the easiest way to go.

Xorifelse · Accepted Answer · 2016-12-22 13:33:05Z

3

As noted by the other answers, it is an issue with PHP which is unresolved as of today but if it is a 'side effect' of var_dump() I am not so sure..

echo ((array) new DateTime())['date']; // Works in PHP 7.

What I am sure about is that if the properties of DateTime where meant to be used by us it would have been made available. But like many internal classes they are not and you shouldn't rely on "hacky" or "glitchy" methods to fix your code. Instead you should use their API.

echo (new DateTime())->format('Y-m-d H:i:s');

If you are not satisfied you can extend the class or perhaps use Carbon that extends it for you.

echo (new Carbon())->toDateTimeString();

If you wounder how var_dump() creates a fake output of an object take a look at __debugInfo()

edited Dec 22, 2016 at 13:33

answered Dec 22, 2016 at 3:26

Xorifelse

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Comments

Sascha A. · Accepted Answer · 2017-04-11 13:06:37Z

-2

If you just use a var_Dump before ask the property date everything works allright:

$mydate = new DateTime();
var_Dump($mydate);
echo '<br>';
echo $mydate->date;

This delivers:

object(DateTime)#1 (3) { ["date"]=> string(26) "2017-04-11 08:44:54.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" }
2017-04-11 08:44:54.000000

So you see the property date exists even for the object. I can't understand this behaviour. Just comment out the var_Dump and you will get the error again.

answered Apr 11, 2017 at 13:06

Sascha A.

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2 Comments

Kaushik Das Over a year ago

error_reporting(0); echo date("Y-m-d H:i:s",strtotime($mydate->date));

Grant G Over a year ago

No it doesn't, certainly not in php7, throws a Notice: Undefined property: DateTime::$date

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