FIX: ensures seconds are displayed when used with dates (#10170)

plugins/discourse-local-dates/assets/javascripts/lib/local-date-builder.js.es6

@@ -24,7 +24,7 @@ export default class LocalDateBuilder {
 
   build() {
     const [year, month, day] = this.date.split("-").map(x => parseInt(x, 10));
-    const [hour, minute] = (this.time || "")
+    const [hour, minute, second] = (this.time || "")
       .split(":")
       .map(x => (x ? parseInt(x, 10) : undefined));
 
@@ -42,6 +42,7 @@ export default class LocalDateBuilder {
       day,
       hour,
       minute,
+      second,
       timezone: this.timezone,
       localTimezone: this.localTimezone
     });

plugins/discourse-local-dates/test/javascripts/lib/local-date-builder-test.js.es6

@@ -1,3 +1,4 @@
+import I18n from "I18n";
 import LocalDateBuilder from "./local-date-builder";
 
 const UTC = "Etc/UTC";
@@ -68,15 +69,23 @@ QUnit.test("date", assert => {
       { formated: "March 22, 2020" },
       "it displays the date without time"
     );
-
-    assert.buildsCorrectDate(
-      { date: "2020-04-11", time: "11:00" },
-      { formated: "April 11, 2020 1:00 PM" },
-      "it displays the date with time"
-    );
   });
 });
 
+QUnit.test("date and time", assert => {
+  assert.buildsCorrectDate(
+    { date: "2020-04-11", time: "11:00" },
+    { formated: "April 11, 2020 1:00 PM" },
+    "it displays the date with time"
+  );
+
+  assert.buildsCorrectDate(
+    { date: "2020-04-11", time: "11:05:12", format: "LTS" },
+    { formated: "1:05:12 PM" },
+    "it displays full time (hours, minutes, seconds)"
+  );
+});
+
 QUnit.test("option[format]", assert => {
   freezeTime({ date: "2020-03-11" }, () => {
     assert.buildsCorrectDate(