Apple calendar sync, timezone, first day of week additions

hooks/firebase/useSignUp.ts

@@ -3,6 +3,7 @@ import auth from "@react-native-firebase/auth";
 import { ProfileType } from "@/contexts/AuthContext";
 import { useSetUserData } from "./useSetUserData";
 import {uuidv4} from "@firebase/util";
+import * as Localization from "expo-localization";
 
 export const useSignUp = () => {
   const { mutateAsync: setUserData } = useSetUserData();
@@ -30,6 +31,7 @@ export const useSignUp = () => {
                 firstName: firstName,
                 lastName: lastName,
                 familyId: uuidv4(),
+                timeZone: Localization.getCalendars()[0].timeZone,
               },
               customUser: res.user,
             });