Wordpress: Query Year in a Range of years - wordpress

Question

I have a start_year and a end_year
f.e: Project-Lorem-Ipsum: $start_year=2001, $end_year=2005
and I need to select a certain year (f.e. $filter_year=2002) and show the posts that are running in this year.
That means, $filter_year could be $start_year or $end_year or between $start_year and $end_year.
I did this sketch to show maybe better what i need,
thanks for any help!
$filter_year=2002;
$posts = get_posts(array(
'posts_per_page' => -1,
'post_type' => 'post',
'meta_query' => array(
'relation' => 'AND',
array(
'key' => 'start_year',
'value' => $filter_year,
'compare' => '???',
),
array(
'key' => 'end_year',
'value' => $filter_year,
'compare' => '???',
),
),

Answer 1

You can use meta query for this. But there are changes to be made to make these work, if not already implemented.
1: You can use the date type in meta query but it will only work in the yyyy-mm-dd format
$start_date = date('Y-m-d', strtotime('1/1/15') ); // cant just use the year, it will see it as a time value
$end_date = date('Y-m-d', strtotime('31/12/15') ); // cant just use the year, it will see it as a time value
'meta_query' => array(
'relation' => 'AND'
array(
'key' => 'start_year',
'value' => $start_date,
'compare' => '>='
),
array(
'key' => 'start_year',
'value' => $end_date,
'compare' => '<='
),
)
2: Convert dates to timestamps (preferred)
$start_date = strtotime('1/1/15'); // cant just use the year, it will see it as a time value
$end_date = strtotime('31/12/15'); // cant just use the year, it will see it as a time value
'meta_query' => array(
'relation' => 'AND'
array(
'key' => 'start_year',
'value' => $start_date,
'compare' => '>='
),
array(
'key' => 'start_year',
'value' => $end_date,
'compare' => '<='
),
)
You can loop over the meta values using wp_query or get_posts and checking to see if the get_post_meta($postid, 'start_year', true); exists.