It  alters the timestamp and is an alias of DateTime::modify()

<?php
$date = date_create(‘2007-05-17’);
date_modify($date, ‘+2 day’);
echo date_format($date, ‘Y-m-d’);
?>

Output

2007-05-19

It sets the ISO date .

<?php
$date = new DateTime();
$date->setISODate(2007, 7);
echo $date->format(‘Y-m-d’) ;
?>

Output

2007-02-12

It formats the interval

<?php
$interval = new DateInterval(‘P12Y14DT16H18M’);
echo $interval->format(‘%d days’);
?>

Output

14 days

It formats the interval and is an Alias of DateInterval::format()

<?php
$interval = new DateInterval(‘P12D’);
echo $interval->format(‘%d days’);
?>

Output

12 days

It sets up a DateInterval from the relative parts of the string.

<?php
echo “<pre>”;
$interval = DateInterval::createFromDateString(‘1 month’);
print_r($interval);
?>

Output

DateInterval Object
(
[y] => 0
[m] => 1
[d] => 0
[h] => 0
[i] => 0
[s] => 0
[invert] => 0
[days] => 0
)

It sets up a DateInterval from the relative parts of the string and is an alias of DateInterval::createFromDateString()

<?php
echo “<pre>”;
$interval = DateInterval::createFromDateString(‘1 month’);
print_r($interval);
?>

Output

DateInterval Object
(
[y] => 0
[m] => 1
[d] => 0
[h] => 0
[i] => 0
[s] => 0
[invert] => 0
[days] => 0
)

It returns the warnings and errors .

<?php
echo “<pre>”;
try {
$date = new DateTime(‘phpcodez’);
} catch (Exception $e) {
print_r(DateTime::getLastErrors());
}
?>

Output

Array
(
[warning_count] => 1
[warnings] => Array
(
[6] => Double timezone specification
)

[error_count] => 1
[errors] => Array
(
[0] => The timezone could not be found in the database
)

)

It returns the warnings and errors and is an alias of DateTime::getLastErrors().

<?php
echo “<pre>”;
$date = date_create(‘phpcodez’);
print_r(date_get_last_errors());
?>

Output

Array
(
[warning_count] => 1
[warnings] => Array
(
[6] => Double timezone specification
)

[error_count] => 1
[errors] => Array
(
[0] => The timezone could not be found in the database
)

)

It Returns date formatted according to given format

<?php
$date = new DateTime(‘2007-05-17’);
echo $date->format(‘Y-m-d H:i:s’);
?>

Output

2007-05-17 00:00:00