Converting to Date in PHP from Yyyymmdd Format

PHP convert date format dd/mm/yyyy = yyyy-mm-dd

Dates in the m/d/y or d-m-y formats are disambiguated by looking
at the separator between the various components: if the separator is a
slash (/), then the American m/d/y is assumed; whereas if the
separator is a dash (-) or a dot (.), then the European d-m-y
format is assumed. Check more here.

Use the default date function.

$var = "20/04/2012";
echo date("Y-m-d", strtotime($var) );

EDIT I just tested it, and somehow, PHP doesn't work well with dd/mm/yyyy format. Here's another solution.

$var = '20/04/2012';
$date = str_replace('/', '-', $var);
echo date('Y-m-d', strtotime($date));

Converting to date in PHP from yyyymmdd format

Use strtotime() to convert a string containing a date into a Unix timestamp:

<?php
// both lines output 813470400
echo strtotime("19951012"), "\n",
     strtotime("12 October 1995");
?>

You can pass the result as the second parameter to date() to reformat the date yourself:

<?php
// prints 1995 Oct 12
echo date("Y M d", strtotime("19951012"));
?>

Note

strtotime() will fail with dates before the Unix epoch at the start of 1970.

As an alternative which will work with dates before 1970:

<?php
// Returns the year as an offset since 1900, negative for years before
$parts = strptime("18951012", "%Y%m%d");
$year = $parts['tm_year'] + 1900; // 1895
$day = $parts['tm_mday']; // 12
$month = $parts['tm_mon']; // 10
?>

Convert number to date in PHP and format to YYYYMMDD

Using date()

Simply write:

<?php

echo date('Ymd', 1441065600);

Otherwise, using a DateTime instance:

Short

<?php

echo (new DateTime())->setTimestamp(1441065600)->format('Ymd');

Note: the setTimestamp() method do not takes a string as parameter! Otherwise, you may want to do so:

Long

<?php

$english = '1441065600';
$timestamp = strtotime($english);
$date = new DateTime($timestamp);
echo $date->format('Ymd'); // 20161214

Descriptions

strtotime() - Parse about any English textual datetime description into a Unix timestamp

DateTime - Representation of date and time

Note: I created a new DateTime instance from the UNIX timestamp, English textual representation may lead to an error.

Other formats

I recommend you to read the DateTime::format() method documentation along with the date() function documentation to learn more about date formats.

Format date from yyyymmdd to Y-m-d with PHP

Use strtotime() to convert a string containing a date into a Unix timestamp:

<?php
// both lines output 813470400
echo strtotime("19951012"), "\n",
     strtotime("12 October 1995");
?>

You can pass the result as the second parameter to date() to reformat the date yourself:

<?php
// prints 1995 Oct 12
echo date("Y-m-d", strtotime("19951012"));
?>

Convert a date format in PHP

Use strtotime() and date():

$originalDate = "2010-03-21";
$newDate = date("d-m-Y", strtotime($originalDate));

(See the strtotime and date documentation on the PHP site.)

Note that this was a quick solution to the original question. For more extensive conversions, you should really be using the DateTime class to parse and format :-)

Convert date from YYYYMMDD to DD/MM/YYYY format in PHP

You can easily use the DateTime class to do this

$retrieved = '20121226';
$date = DateTime::createFromFormat('Ymd', $retrieved);
echo $date->format('d/m/Y');

http://php.net/manual/en/datetime.format.php

Format date dd/mm/yyyy to yyyy-mm-dd PHP

You might want to use DateTime::createFromFormat:

$show_date = DateTime::createFromFormat('d/m/Y', $dateInput)->format('Y-m-d');

Converting string to Date and DateTime

Use strtotime() on your first date then date('Y-m-d') to convert it back:

$time = strtotime('10/16/2003');

$newformat = date('Y-m-d',$time);

echo $newformat;
// 2003-10-16

Make note that there is a difference between using forward slash / and hyphen - in the strtotime() function. To quote from php.net:

Dates in the m/d/y or d-m-y formats
are disambiguated by looking at the
separator between the various
components: if the separator is a
slash (/), then the American m/d/y is
assumed; whereas if the separator is a
dash (-) or a dot (.), then the
European d-m-y format is assumed.

To avoid potential ambiguity, it's best to use ISO 8601 (YYYY-MM-DD) dates or DateTime::createFromFormat() when possible.

PHP how to convert dd/mm/yy to yyyy-mm-dd

With an ambigous date like you have it is better to use the DateTime class as you can set the input format. See the following example from the documentation:

$var = '20/01/21'; 

$date = DateTime::createFromFormat('d/m/y', $var); // "d/m/y" corresponds to the input format
echo $date->format('Y-m-d'); //outputs 2021-01-20

How to convert a date from yyyy-mm-dd to Month(in words) day year?

Use the PHP date function to reformat it:

echo date('F j, Y',strtotime($row['date']));  // January 30, 2015, for example.

See date for many more formatting options.

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