It’s possible to add a custom dropdown box to the submit meta-box:
where the user can only select X days into the future.
If the date is too far, we set the post date to the current date.
Here’s how it looks like in action when I add a new post, change the date and publish it:
and we see here the scheduling.
Demo Plugin
Here’s one idea, that you can hopefully test further and adjust to your needs.
The configuration is of this form:
class Config
{
const CPT = 'post';
const INTERVAL = 8;
}
where the CPT is the custom post type to target and INTERVAL is the maximum allowed days into the future.
We use three classes:
Mainfor the plugin setup.Dropdownthat takes care of the custom dropdown box.Restrictionsto handle the restrictions when the post data is saved.
Here’s the plugin:
<?php
/**
* Plugin Name: Publish Date Restrictions
* Plugin URI: http://wordpress.stackexchange.com/a/205252/26350
* Author: Birgir Erlendsson (birgire)
* Version: 0.0.2
*/
namespace wpse\birgire;
add_action( 'admin_init', function()
{
if( class_exists( 'wpse\birgire\Main' ) )
{
$main = new Main;
$main->init(
new Dropdown,
new Restrictions
);
}
} );
class Config
{
const CPT = 'post';
const INTERVAL = 8;
}
interface MainInterface
{
public function init( DropdownInterface $dropdown, RestrictionsInterface $restrictions );
public function wp_insert_post_data( Array $data, Array $arr );
public function do_meta_boxes();
public function modified_meta_box( \WP_Post $post, Array $args );
}
interface DropdownInterface
{
public function merge( \WP_Post $post, $html="" );
}
interface RestrictionsInterface
{
public function post_data( Array $data, Array $arr );
}
class Dropdown implements DropdownInterface
{
private function get_options( \WP_Post $post )
{
// current post's Y-m-d time
$post_ymd = ( new \DateTime( $post->post_date ) )->format( 'Y-m-d' );
// Current local timestamp
$now = current_time( 'timestamp' );
// Construct custom +8days "Y-m-d" dropdown options
$options="";
for( $i = 0; $i < (int) Config::INTERVAL; $i++ )
{
// Next YMD according to the local time
$ymd = ( new \DateTime )
->setTimestamp( $now )
->modify( sprintf( '+%dday', $i ) )
->format( 'Y-m-d' );
// Label
switch ( $i )
{
case 0:
$label = __( 'Today' );
break;
case 1:
$label = __( 'Tomorrow' );
break;
default:
$label = $ymd;
}
// Options
$options .= sprintf(
'<option value="%s"%s>%s</option>',
$ymd,
selected( $ymd, $post_ymd, 0 ),
$label
);
} // end of for loop
return $options;
}
private function get_style()
{
// Hide the current "Y, m, d" inputs
// Note: We can't remove it with preg_replace, because of Javascript checks
return '
<style>
.timestamp-wrap label:nth-child(5),
.timestamp-wrap label:nth-child(2),
.timestamp-wrap label:nth-child(3),
.timestamp-wrap label:nth-child(4) {
display:none !important;
}
</style>
';
}
private function get_html( \WP_Post $post )
{
// Construct custom +8days "Y-m-d" dropdown
return sprintf(
'<label><span class="screen-reader-text">YMD</span>
<select id="wpse_ymd" name="wpse_ymd">
<option value="">Select</option> %s
</select>
</label>
%s',
$this->get_options( $post ),
$this->get_style()
);
}
public function merge( \WP_Post $post, $html="" )
{
// Create a +8days "Y-m-d" dropdown
$dropdown = $this->get_html( $post );
// Inject into the metabox HTML
$from = '<label><span class="screen-reader-text">Month</span>';
$to = $dropdown . $from;
return str_replace( $from, $to, $html );
}
}
class Restrictions implements RestrictionsInterface
{
public function post_data( Array $data, Array $arr )
{
// Target the corresponding post type when the restricted 'wpse_ymd' is posted
if(
! empty( $data['post_type'] )
&& Config::CPT !== $data['post_type']
)
return $data;
// input date is valid
$valid = false;
// Current local datetime object
$local = ( new \DateTime )->setTimestamp( current_time( 'timestamp' ) );
// Process the selected custom dropdown date
if( ! empty( $arr['wpse_ymd'] ) )
{
// Create datetime objects
$input_date_obj = ( new \DateTime )->createFromFormat( 'Y-m-d', $arr['wpse_ymd'] );
$post_date_obj = ( new \DateTime )->createFromFormat( 'Y-m-d H:i:s', $data['post_date'] );
// If valid date and not too far into the future!
if( $this->is_valid_date( $input_date_obj )
&& (int) Config::INTERVAL >= $this->signed_diff_in_days( $local, $input_date_obj )
) {
// Create mysql date strings
$new_post_date_obj = $post_date_obj->setDate(
$input_date_obj->format( 'Y' ),
$input_date_obj->format( 'm' ),
$input_date_obj->format( 'd' )
);
// Override current post_date and post_date_gmt
$data['post_date'] = $new_post_date_obj->format( 'Y-m-d H:i:s' );
$data['post_date_gmt'] = $new_post_date_obj->setTimezone( new \DateTimeZone( 'GMT' ) )->format( 'Y-m-d H:i:s' );
// Set status to 'future' if > now
if( $new_post_date_obj->format( 'timestamp' ) > $now )
$data['post_status'] = 'future';
$valid = true;
}
}
// Set the post date to the current time,
// if user selected a date too far into the future
if( ! $valid )
{
$data['post_date'] = $local->format( 'Y-m-d H:i:s' );
$data['post_date_gmt'] = $local->setTimezone( new \DateTimeZone( 'GMT' ) )->format( 'Y-m-d H:i:s' );
}
return $data;
}
private function is_valid_date( \DateTime $obj )
{
return
is_a( $obj, '\DateTime' )
&& 0 === $obj->getLastErrors()['error_count']
&& 0 === $obj->getLastErrors()['warning_count'];
}
private function signed_diff_in_days( \DateTime $dt1, \DateTime $dt2 )
{
$dt = $dt1->diff( $dt2 );
// Calculate the number of days (both positive or negativve)
// See more here http://stackoverflow.com/a/22967760/2078474
return $dt->days * ( $dt->invert ? -1 : 1 );
}
}
class Main implements MainInterface
{
private $dropdown;
private $restrictions;
public function init( DropdownInterface $dropdown, RestrictionsInterface $restrictions )
{
$this->restrictions = $restrictions;
$this->dropdown = $dropdown;
add_action( 'do_meta_boxes', [ $this, 'do_meta_boxes' ] );
add_filter( 'wp_insert_post_data', [ $this, 'wp_insert_post_data'], 10, 2 );
}
public function wp_insert_post_data( Array $data, Array $arr )
{
return $this->restrictions->post_data( $data, $arr );
}
public function do_meta_boxes()
{
// Remove submitdiv meta-box
remove_meta_box(
'submitdiv',
sanitize_key( Config::CPT ),
'side'
);
// Add it again, modified
add_meta_box(
'submitdiv',
__( 'Publish' ),
[ $this, 'modified_meta_box' ],
sanitize_key( Config::CPT ),
'side',
'high'
);
}
public function modified_meta_box( \WP_Post $post, Array $args )
{
// Inject our custom +8days "Y-m-d" dropdown
echo $this->dropdown->merge(
$post,
$this->get_meta_box( $post, $args ) // Grab the current submit box
);
}
private function get_meta_box( \WP_Post $post, Array $args )
{
ob_start();
post_submit_meta_box( $post, $args = [] );
return ob_get_clean();
}
} // end class