Agendamento de Popup no Plugin Popup Maker

functions.php

<?php 

// Popup Maker - https://wordpress.org/plugins/popup-maker/

function mycustom_popup_is_loadable( $is_loadable, $popup_id) {
	if( $popup_id == 80 ) { // ID do Post
        $start  = strtotime( '2015-11-23 14:00:00' ); // Data de Início
        $end    = strtotime( '2015-11-26 23:59:00' ); // Data do Término
        $now    = strtotime( 'now' );
            if( $now >= $start && $now <= $end ) {
              return true;
            }
            else {
              return false;
            }
    }
    
    // Caso use mais de um Popup

    if( $popup_id == 91 ) { // ID do Post
        $start  = strtotime( '2015-11-27 00:00:00' ); // Data de Início
        $end    = strtotime( '2015-11-27 23:59:00' ); // Data do Término
        $now    = strtotime( 'now' );
            if( $now >= $start && $now <= $end ) {
              return true;
            }
            else {
              return false;
            }
    }
	return $is_loadable;
}
add_filter('popmake_popup_is_loadable', 'mycustom_popup_is_loadable', 1000, 2 );

?>