PHP Timestamp into DateTime
Solution 1
You don't need to turn the string into a timestamp in order to create the DateTime
object (in fact, its constructor doesn't even allow you to do this, as you can tell). You can simply feed your date string into the DateTime
constructor as-is:
// Assuming $item->pubDate is "Mon, 12 Dec 2011 21:17:52 +0000"
$dt = new DateTime($item->pubDate);
That being said, if you do have a timestamp that you wish to use instead of a string, you can do so using DateTime::setTimestamp()
:
$timestamp = strtotime('Mon, 12 Dec 2011 21:17:52 +0000');
$dt = new DateTime();
$dt->setTimestamp($timestamp);
Edit (2014-05-07):
I actually wasn't aware of this at the time, but the DateTime
constructor does support creating instances directly from timestamps. According to this documentation, all you need to do is prepend the timestamp with an @
character:
$timestamp = strtotime('Mon, 12 Dec 2011 21:17:52 +0000');
$dt = new DateTime('@' . $timestamp);
Solution 2
While @drrcknlsn is correct to assert there are multiple ways to convert a time string to a datatime, it's important to realize that these different ways don't deal with timezones in the same way.
Option 1 : DateTime('@' . $timestamp)
Consider the following code :
date_format(date_create('@'. strtotime('Mon, 12 Dec 2011 21:17:52 +0800')), 'c');
The strtotime
bit eliminates the time zone information, and the date_create
function assumes GMT (Europe/Brussels
).
As such, the output will be the following, no matter which server I run it on :
2011-12-12T13:17:52+00:00
Option 2 : date_create()->setTimestamp($timestamp)
Consider the following code :
date_format(date_create()->setTimestamp(strtotime('Mon, 12 Dec 2011 21:17:52 +0800')), 'c');
You might expect this to produce the same output. However, if I execute this code from a Belgian server, I get the following output :
2011-12-12T14:17:52+01:00
Unlike the date_create
function, the setTimestamp
method assumes the time zone of the server ('Europe/Brussels'
in my case) rather than GMT.
Explicitly setting your time zone
If you want to make sure your output matches the time zone of your input, it's best to set it explicitly.
Consider the following code :
date_format(date_create('@'. strtotime('Mon, 12 Dec 2011 21:17:52 +0800'))->setTimezone(new DateTimeZone('Asia/Hong_Kong')), 'c')
Now, also consider the following code :
date_format(date_create()->setTimestamp(strtotime('Mon, 12 Dec 2011 21:17:52 +0800'))->setTimezone(new DateTimeZone('Asia/Hong_Kong')), 'c')
Because we explicitly set the time zone of the output to match that of the input, both will create the same (correct) output :
2011-12-12T21:17:52+08:00
Solution 3
Probably the simplest solution is just:
DateTime::createFromFormat('U', $timeStamp);
Where 'U' means Unix epoch. See docs: http://php.net/manual/en/datetime.createfromformat.php
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Updated on May 18, 2020Comments
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JREAM almost 4 years
Do you know how I can convert this to a strtotime, or a similar type of value to pass into the DateTime object?
The date I have:
Mon, 12 Dec 2011 21:17:52 +0000
What I've tried:
$time = substr($item->pubDate, -14); $date = substr($item->pubDate, 0, strlen($time)); $dtm = new DateTime(strtotime($time)); $dtm->setTimezone(new DateTimeZone(ADMIN_TIMEZONE)); $date = $dtm->format('D, M dS'); $time = $dtm->format('g:i a');
The above is not correct. If I loop through a lot of different dates its all the same date.
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JREAM over 11 yearsThis works great. I had tried this previously but must have not given it enough of a chance!!! thanks :))
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John Slegers about 8 yearsNote that
new DateTime('@' . $timestamp)
and$dt = new DateTime(); $dt->setTimestamp($timestamp)
don't deal with timezones the same way. See my answer @ stackoverflow.com/questions/12038558/… for more details. -
Bouke Versteegh over 6 yearsThis method also ignores timezone
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forsberg over 6 years@BoukeVersteegh and which one doesn't?
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Accountant م over 4 years@BoukeVersteegh This is a Unix timestamp!, it frees you from timezones problems while creating the object. just use
->setTimezone
to set the preferable timezone before calling->format()
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Accountant م over 4 years@BoukeVersteegh Check this big note from the PHP manual "The $timezone parameter and the current timezone are ignored when the $time parameter either is a UNIX timestamp (e.g. @946684800) or specifies a timezone (e.g. 2010-01-28T15:00:00+02:00). "
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the_nuts over 3 yearsUnix timestamps don't have timezones, they are always UTC by definition
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Manngo over 2 yearsI think
new DateTime("@$timestamp")
may be more readable. -
Dion almost 2 yearsA little shorter:
$date = (new DateTime)->setTimestamp($timestamp);