disable-date-time.php

class disable_date_time_for_shipping_method{
	static $instance = null;

	public $shipping_method = 'free_shipping:55';//'flat_rate:2160';

	static function get_instance(){
		if(is_null(self::$instance)){
			self::$instance = new self();
		}
		return self::$instance;
	}

	function __construct(){
		add_filter('pisol_pldt_settings_filter', array($this, 'hideDateTimeField'), PHP_INT_MAX);
        add_filter('pisol_dtt_setting_filter_pi_datetime', [$this, 'disableDateTimeField'], PHP_INT_MAX);
	}

	function hideDateTimeField($settings){
		if($this->disable_date_time_method_selected()){
			$settings['disable_date_time_field'] = 1;
		}
		
		return $settings;
	}

	function disable_date_time_method_selected(){
		if(isset(WC()->session) && is_object(WC()->session)){
			$chosen_shipping_methods = WC()->session->get('chosen_shipping_methods');
			if(is_array($chosen_shipping_methods)){
				foreach($chosen_shipping_methods as $shipping_method){
					if($shipping_method == $this->shipping_method){
						return true;
					}
				}
			}
		}
		return false;
	}

	function disableDateTimeField($enabled){
		if($this->disable_date_time_method_selected()){
			return 'disable-both';
		}
		return $enabled;
	}
}

disable_date_time_for_shipping_method::get_instance();