FIX: improves code, tests and utc handling of local-dates (#6644)

plugins/discourse-local-dates/test/javascripts/acceptance/local-dates-composer-test.js.es6

@@ -0,0 +1,50 @@
+import { acceptance } from "helpers/qunit-helpers";
+
+acceptance("Local Dates - composer", {
+  loggedIn: true,
+  settings: { discourse_local_dates_enabled: true }
+});
+
+test("composer bbcode", async assert => {
+  const getAttr = attr => {
+    return find(".d-editor-preview .discourse-local-date.cooked-date").attr(
+      `data-${attr}`
+    );
+  };
+
+  await visit("/");
+  await click("#create-topic");
+
+  await fillIn(
+    ".d-editor-input",
+    '[date=2017-10-23 time=01:30:00 displayedZone="America/Chicago" format="LLLL" calendar="off" recurring="1.weeks" timezone="Asia/Calcutta" timezones="Europe/Paris|America/Los_Angeles"]'
+  );
+
+  assert.equal(getAttr("date"), "2017-10-23", "it has the correct date");
+  assert.equal(getAttr("time"), "01:30:00", "it has the correct time");
+  assert.equal(
+    getAttr("displayed-zone"),
+    "America/Chicago",
+    "it has the correct displayed zone"
+  );
+  assert.equal(getAttr("format"), "LLLL", "it has the correct format");
+  assert.equal(
+    getAttr("timezones"),
+    "Europe/Paris|America/Los_Angeles",
+    "it has the correct timezones"
+  );
+  assert.equal(getAttr("recurring"), "1.weeks", "it has the correct recurring");
+  assert.equal(
+    getAttr("timezone"),
+    "Asia/Calcutta",
+    "it has the correct timezone"
+  );
+
+  await fillIn(
+    ".d-editor-input",
+    '[date=2017-10-24 format="LL" timezone="Asia/Calcutta" timezones="Europe/Paris|America/Los_Angeles"]'
+  );
+
+  assert.equal(getAttr("date"), "2017-10-24", "it has the correct date");
+  assert.notOk(getAttr("time"), "it doesn’t have time");
+});