Its an alias of DateTime::sub()and subtracts an amount of days, months, years, hours, minutes and seconds from a DateTime object

<?php
$date = date_create(‘2012-05-17′);
date_sub($date, date_interval_create_from_date_string(’11 days’));
echo date_format($date, ‘Y-m-d’);
?>

Output

2012-05-06

It returns associative array with detailed info about given date

Example

<?php
echo “<pre>”;
print_r(date_parse(“2006-12-12 10:00:00.5”));
?>

Output

Array
(
[year] => 2006
[month] => 12
[day] => 12
[hour] => 10
[minute] => 0
[second] => 0
[fraction] => 0.5
[warning_count] => 0
[warnings] => Array
(
)

[error_count] => 0
[errors] => Array
(
)

[is_localtime] =>
)

It returns details  about given date formatted according to the specified format.

Example

<?php
echo “<pre>”;
$date = “20.4.2008”;
print_r(date_parse_from_format(“j.n.Y H:iP”, $date));
?>

Output

Array
(
[year] => 2008
[month] => 4
[day] => 20
[hour] =>
[minute] =>
[second] =>
[fraction] =>
[warning_count] => 0
[warnings] => Array
(
)

[error_count] => 1
[errors] => Array
(
[9] => Data missing
)

[is_localtime] =>
)

its an alias of DateTime::getOffset()and returns the timezone offset .

<?php
$time = date_create(‘2012-05-17’, timezone_open(‘America/New_York’));
echo date_offset_get($time) . “n”;
?>

Output

-14400

It  alters the timestamp

Example

<?php
$date = new DateTime(‘2006-05-17’);
$date->modify(‘+2 day’);
echo $date->format(‘Y-m-d’);
?>

Output

2006-05-19

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