Fix bugs with time picker

* Load UTC time correctly at page load
* Don't translate to/from timezone when using the browser date/time
  input

reminder-dashboard/src/components/Reminder/CreateReminder.tsx

@@ -10,6 +10,7 @@ import { useQuery } from "react-query";
 import "./styles.scss";
 import { useGuild } from "../App/useGuild";
 import { DEFAULT_COLOR } from "./Embed";
+import { useTimezone } from "../App/TimezoneProvider";
 
 function defaultReminder(): Reminder {
     return {
@@ -38,7 +39,7 @@ function defaultReminder(): Reminder {
         tts: false,
         uid: "",
         username: "",
-        utc_time: DateTime.now().toFormat("yyyy-LL-dd'T'HH:mm:ss"),
+        utc_time: DateTime.now().setZone("UTC").toFormat("yyyy-LL-dd'T'HH:mm:ss"),
     };
 }
 

reminder-dashboard/src/components/Reminder/TimeInput.tsx

@@ -284,11 +284,7 @@ export const TimeInput = ({ defaultValue, onInput }) => {
                 onInput={(ev) => {
                     ev.currentTarget.value === ""
                         ? updateTime(null)
-                        : setTime(
-                              DateTime.fromISO(ev.currentTarget.value, { zone: timezone }).setZone(
-                                  "UTC",
-                              ),
-                          );
+                        : setTime(DateTime.fromISO(ev.currentTarget.value, { zone: "UTC" }));
                 }}
             ></input>
         </>