Make product purchasable based on the vendor opening and closing time in dokan plugin.

dokan-add-to-cart.php

<?php
/**
 * Hide or display add to cart button based on opening hours.
 */
function prefix_woocommerce_is_purchasable( $is_purchasable, $product ) {

    // Get the store id.
    $store_id = get_post_field( 'post_author', $product->get_id() );

    // Get the store info.
    $store_info = dokan_get_store_info( $store_id );

    // Get the store time enabled or not.
    $is_dokan_store_time_enabled = $store_info['dokan_store_time_enabled'];

    // If the store time is enabled, check whether the store is open or not.
    // Else the store is open.
    if ( 'yes' === $is_dokan_store_time_enabled ) {
        $is_purchasable = dokan_is_store_open( $store_id );
    } else  {
        $is_purchasable = true;
    }

    return $is_purchasable;

}
add_filter( 'woocommerce_is_purchasable', 'prefix_woocommerce_is_purchasable', 10, 2 );

@mi5t4n
Thanks, I tried it, but it didn't work, maybe not enough experience. So I just changed in the core of the plugin module

// chat button on product page
        add_action( 'woocommerce_after_add_to_cart_button', [ $this, 'render_live_chat_button_product_page' ] );

on

// chat button on product page
        add_action( 'woocommerce_single_product_summary', [ $this, 'render_live_chat_button_product_page' ], 100 );

It's tough, but I couldn't do it any other way. In any case, thanks for the tip.

@renrax Glad to help. Let me know, if you need help with anything.