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I have a custom field which stores a date in a timestamp. I want to run a query that display posts based on the month, for example all entries from March, the specific day or year doesn't matter. I'm guessing i need to use the DATE or the DATETIME type for the meta query, but i don't know how to proceed:

if ($_GET['month']) {
    $meta_query[] = array(
            'key' => 'event_start_date',
            'value' => $_GET['month']

$args = array(
    'post_type' => 'event',
    'paged' => $paged,
    'posts_per_page' => -1,
    'tax_query' => $cleanArray,
    'meta_key' => 'event_start_date',
    'orderby' => 'meta_value_num',
    'order' => 'DESC',
    'meta_query'=> $meta_query

$events = new WP_Query($args);
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I don't think you'll be able to do this with just WP_Query, you'll need a filter on posts_where to query on just the month using MySQL's month function. – Milo Oct 14 '13 at 16:10
up vote 1 down vote accepted

You need the 2 digit month number that you want to query on and then use the code below. This should be easy with php (for example, see this post). In the code below $month is the number of the month in a 2 digit format, eg March would be 03.

$start_date = date('Y'.$month.'01'); // First day of the month
$end_date = date('Y'.$month.'t'); // 't' gets the last day of the month

$meta_query = array(
    'key'       => 'event_start_date',
    'value'     => array($start_date, $end_date),
    'compare'   => 'BETWEEN',
    'type'      => 'DATE'
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