In PHP I wanted to fetch the first day and the last day of the last 7 days. I have the current date:
$data_actula = date("Y-m-d");
Now I want to go get the dates 7 days ago. For example, today is 2014-07-29, I want to find the 2014-07-22 value. With this I must always keep in mind the changes of the months. How can I reach this value?
The DateTime class is much more preferable to manipulate date / time and relative:
<?php
date_default_timezone_set( 'America/Sao_Paulo' );
$time = new DateTime( '2014-07-29' );
print '<pre>'; print_r( $time ); print '</pre>';
$time -> sub( new DateInterval( 'P7D' ) );
print '<pre>'; var_dump( $time, $time -> format( 'Y-m-d' ) ); print '</pre>';
The only small drawback is the DateInterval requirement to subtract (or add) a range of time since it has a syntax a little differentiated , based on the specification ISO 8601
<?php
//Precisa de definir a função abaixo para evitar warnings
date_default_timezone_set('America/Los_Angeles');
//Sua data original
$Date = "2014-07-29";
//Modifica a data (7 dias atrás)
$data_actula = date('Y-m-d', strtotime($Date. ' - 7 days'));
//Mostra resultado
echo $data_actula;
?>
Note that if you want to add it is very similar:
$data_actula = date('Y-m-d', strtotime($Date. ' + 7 days'));
You can solve this as follows:
<?php
$data_actula = date("Y-m-d");
$danta_anterior = date("Y-m-d", strtotime($data_actula) - (7 * 24 * 60 * 60));
See running here: link
Still, you can use DateInterval in an easier way if you're not getting used to the instantiation parameters of it, like me. Just use the DateTime::createFromDateString() method;
See:
$time = new DateTime('2014-07-29', new DateTimeZone('America/Sao_Paulo'));
print_r($time);
$time->sub(DateInterval::createFromDateString('-7 days'));
var_dump($time,$time->format( 'Y-m-d' ));