WP_Query: Get Posts by Relative Date

Someone asked me today how to use WP_Query to get posts by a relative date. The codex provides an example on how to achieve this. Heres what is shown on the codex.

<?php /** NOTE: This is the example from the Codex, which think is BAD. **/
// Create a new filtering function that will add our where clause to the query
function filter_where( $where = '' ) {
// posts in the last 30 days (hardcoded)
$where .= " AND post_date > '" . date('Y-m-d', strtotime('-30 days')) . "'";
return $where;
//Requires immediate additiona and removal of the filter for intended use.
add_filter( 'posts_where', 'filter_where' );
$query = new WP_Query( $query_string );
remove_filter( 'posts_where', 'filter_where' );

I feel that its sloppy and not very flexible. Having to add the filter and remove it each time you want to do this is ugly. I solved this some time ago and had to dig through some old code to find it.

* Allows WP_Query to use a 'since' argument to query for
* relative date queries.
* Usage: Query posts from last 30 days
* $query = new WP_Query('since' => '-30 days');
* @uses strtotime()
* @author Eddie Moya
function filter_where_add_since( $where = '', $query) {
if( isset($query->query_vars['since']) ){
$where .= " AND post_date > '" . date('Y-m-d', strtotime($query->query_vars['since'])) . "'";
return $where;
add_filter( 'posts_where', 'filter_where_add_since', 10, 2 );

Ultimately what I have done is the same solution, using the same filter, and utilizing strtotime() to get the relative date. However  i’ve wrapped it into a simple “since” parameter that can be used on any query. Just a little nicer and simpler to use.

This technique can easily be adapted to other custom parameters which result in modifications to the where or join filters.

One Comment on “WP_Query: Get Posts by Relative Date”

  1. I always find it annoying to filter for querying, but that’s a nice trick filtering on a query_var. Also see #18694

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