diff --git a/src/utils.h b/src/utils.h
index 44e3ecb..79aa0b5 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -19,8 +19,10 @@ struct WasteDate {
     std::vector<Waste> wasteTypes;
 };
 
-std::vector<WasteDate> parseCsv(const std::string& csv);
+std::vector<WasteDate> parseCsv(const std::string &csv);
 
 static int wifi_setup_impl(uint32_t country, const std::string &ssid, const std::string &pw,
                            bool firstTry = true);
-void wifi_setup();
\ No newline at end of file
+void wifi_setup();
+
+bool isDST(int8_t day, int8_t month, int8_t dow);
\ No newline at end of file