get_submission_start_end_ff.php

function get_fluentform_schedule_dates( $form_id ) {
    global $wpdb;

    if ( ! $form_id ) {
        return 'Invalid form ID.';
    }

    $table_name = $wpdb->prefix . 'fluentform_form_meta';

    // Get all meta for the form
    $results = $wpdb->get_results(
        $wpdb->prepare(
            "SELECT meta_key, value FROM $table_name WHERE form_id = %d",
            $form_id
        ),
        ARRAY_A
    );
	
	

    if ( empty( $results ) ) {
        return 'No meta data found for this form.';
    }

    $meta_data = [];
    foreach ( $results as $row ) {
        $meta_data[ $row['meta_key'] ] = maybe_unserialize( $row['value'] );
    }


    // The scheduling info is usually inside the $'form_settings' meta key
    $form_settings = isset( $meta_data['formSettings'] ) ? json_decode($meta_data['formSettings']) : [];
	
	$form_restrictions = $form_settings->restrictions;
	
	$scheduleFormEnabled = $form_restrictions -> scheduleForm -> enabled;
	
	if($scheduleFormEnabled){
		$schedule_start = $form_restrictions -> scheduleForm -> start;
		$schedule_end = $form_restrictions -> scheduleForm -> end;
		
		
    ob_start();
    echo "<div class='ffp-schedule-dates'>";
    if ( $schedule_start ) {
        echo "<strong>Submission Start:</strong> " . esc_html( (new DateTime($schedule_start))->format('F j, Y H:i \U\T\C') ) . "<br>";

    } else {
        echo "<strong>Submission Start:</strong> Not set.<br>";
    }

    if ( $schedule_end ) {
        echo "<strong>Submission Start:</strong> " . esc_html( (new DateTime($schedule_end))->format('F j, Y H:i \U\T\C') ) . "<br>";

    } else {
        echo "<strong>Submission End:</strong> Not set.";
    }
    echo "</div>";
	}
	

   

    return ob_get_clean();
}

// Usage example via shortcode:
function ffp_schedule_shortcode( $atts ) {
    $atts = shortcode_atts( [
        'id' => 0,
    ], $atts );

    return get_fluentform_schedule_dates( intval( $atts['id'] ) );
}
add_shortcode( 'ffp_schedule', 'ffp_schedule_shortcode' );