A simple example of how to show dates in user locale

show-date-in-user-locale.js

const SERVER_URL = "https://donamaid.herokuapp.com";

const fetchServer = async (path, opts = {}) =>
  (await fetch(`${SERVER_URL}/${path}`, opts)).json();

const createServerAPI = token => ({
  get: (path, opts = {}) => {
    return fetchServer(path, {
      method: "GET",
      headers: {
        Authorization: `Bearer ${token}`
      },
      ...opts
    });
  }
});

(async () => {
  const { data: { token, account: { id } } } = await fetchServer(
    "authentication",
    {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        email: "USER_EMAIL",
        password: "USER_PASSWORD"
      })
    }
  );

  const api = createServerAPI(token);

  try {
    const { data: { attributes: { language, time_zone } } } = await api.get(
      `accounts/${id}`
    );
    console.log(new Date().toLocaleString(language, { timeZone: time_zone }));
  } catch (e) {
    console.log(e);
  }
})();