Update/Improve timezone handling

src/App.vue

@@ -11,7 +11,7 @@ import NavBar from '@/components/layout/NavBar.vue';
 import NavFooter from '@/components/layout/NavFooter.vue';
 import Body from '@/components/layout/Body.vue';
 import { setTimezone } from './shared/formatters';
-import { defineComponent, onMounted } from '@vue/composition-api';
+import { defineComponent, onMounted, watch } from '@vue/composition-api';
 import { useSettingsStore } from './stores/settings';
 
 export default defineComponent({
@@ -22,6 +22,13 @@ export default defineComponent({
     onMounted(() => {
       setTimezone(settingsStore.timezone);
     });
+    watch(
+      () => settingsStore.timezone,
+      (tz) => {
+        console.log('timezone changed', tz);
+        setTimezone(tz);
+      },
+    );
     return {};
   },
 });

src/shared/formatters/timeformat.ts

@@ -20,19 +20,11 @@ function getTimeZone(tz?: string): string {
   return tz || locTimeZone;
 }
 
-/**
- *
- * @param ts Convert timestamp or Date to datetime (in correct timezone)
- * @param timezone timezone to use
- * @returns Date object (in timezone)
- */
-function convertToDate(ts: number | Date, timezone?: string): Date {
-  const date = toDate(ts);
-  const currentTz = Intl.DateTimeFormat().resolvedOptions().timeZone;
-  if (getTimeZone(timezone) === 'UTC') {
-    return utcToZonedTime(date, currentTz);
-  }
-  return date;
+function formatDate(date: Date, formatPattern: string, timezone?: string): string {
+  const timezoneRes = getTimeZone(timezone);
+  return format(utcToZonedTime(date, timezoneRes), formatPattern, {
+    timeZone: timezoneRes,
+  });
 }
 
 /**
@@ -40,7 +32,7 @@ function convertToDate(ts: number | Date, timezone?: string): Date {
  * @param ts Timestamp as number or date (in utc!!)
  */
 export function timestampms(ts: number | Date): string {
-  return format(convertToDate(ts), 'yyyy-MM-dd HH:mm:ss', { timeZone: locTimeZone });
+  return formatDate(toDate(ts), 'yyyy-MM-dd HH:mm:ss');
 }
 
 /**
@@ -50,9 +42,7 @@ export function timestampms(ts: number | Date): string {
  * @returns formatted date in desired timezone (or globally configured timezone)
  */
 export function timestampmsWithTimezone(ts: number | Date, timezone?: string): string {
-  return format(convertToDate(ts, timezone), 'yyyy-MM-dd HH:mm:ss (z)', {
-    timeZone: getTimeZone(timezone),
-  });
+  return formatDate(toDate(ts), 'yyyy-MM-dd HH:mm:ss (z)', timezone);
 }
 
 /**
@@ -60,7 +50,7 @@ export function timestampmsWithTimezone(ts: number | Date, timezone?: string): s
  * @param ts
  */
 export function timestampToDateString(ts: number | Date): string {
-  return format(convertToDate(ts), 'yyyy-MM-dd');
+  return formatDate(toDate(ts), 'yyyy-MM-dd');
 }
 
 /**
@@ -72,7 +62,7 @@ export function dateStringToTimeRange(datestring: string): string {
 }
 
 export function timestampHour(ts: number): number {
-  return getHours(convertToDate(ts));
+  return Number(formatDate(toDate(ts), 'HH'));
 }
 
 /**
@@ -90,3 +80,8 @@ export default {
   dateStringToTimeRange,
   setTimezone,
 };
+
+export const exportForTesting = {
+  getTimeZone,
+  formatDate,
+};

src/stores/settings.ts

@@ -44,16 +44,6 @@ export const useSettingsStore = defineStore('uiSettings', {
     },
   },
   actions: {
-    setOpenTradesInTitle(locked: string) {
-      this.openTradesInTitle = locked;
-    },
-    setTimeZone(timezone: string) {
-      setTimezone(timezone);
-      this.timezone = timezone;
-    },
-    setBackgroundSync(value: boolean) {
-      this.backgroundSync = value;
-    },
     async loadUIVersion() {
       if (import.meta.env.PROD) {
         try {

tests/unit/timeformat.spec.ts

@@ -0,0 +1,61 @@
+import {
+  exportForTesting,
+  timestampms,
+  timestampmsWithTimezone,
+  setTimezone,
+  timestampToDateString,
+  dateStringToTimeRange,
+  timestampHour,
+} from '@/shared/formatters';
+
+const { getTimeZone } = exportForTesting;
+
+// 1651057500000 = 2022-04-27T11:05:00+00:00
+
+describe('timeformatter.ts', () => {
+  it('sets timezone correctly', () => {
+    expect(getTimeZone() == 'UTC');
+    expect(getTimeZone(undefined) == 'UTC');
+    setTimezone('CET');
+    expect(getTimeZone() == 'CET');
+    setTimezone('UTC');
+    expect(getTimeZone() == 'UTC');
+  });
+  it('timestampmsWithTimezone convert correctly', () => {
+    expect(getTimeZone(undefined) == 'UTC');
+    setTimezone('UTC');
+    expect(timestampmsWithTimezone(1651057500000, 'CET')).toEqual('2022-04-27 13:05:00 (GMT+2)');
+    expect(timestampmsWithTimezone(1651057500000, 'UTC')).toEqual('2022-04-27 11:05:00 (UTC)');
+    expect(timestampmsWithTimezone(1651057500000)).toEqual('2022-04-27 11:05:00 (UTC)');
+    setTimezone('UTC');
+    expect(timestampmsWithTimezone(1651057500000)).toEqual('2022-04-27 11:05:00 (UTC)');
+  });
+  it('timestampms convert correctly', () => {
+    setTimezone('UTC');
+    expect(timestampms(1651057500000)).toEqual('2022-04-27 11:05:00');
+    setTimezone('CET');
+    expect(timestampms(1651057500000)).toEqual('2022-04-27 13:05:00');
+  });
+  it('timestampToDateString converts to date', () => {
+    expect(timestampToDateString(1651057500000)).toEqual('2022-04-27');
+
+    // Set close to midnight - so timezone matters
+    // 2022-04-27T11:26:19 UTC
+    const timestamp = 1651101979000;
+    setTimezone('UTC');
+    expect(timestampToDateString(timestamp)).toEqual('2022-04-27');
+    setTimezone('CET');
+    expect(timestampToDateString(timestamp)).toEqual('2022-04-28');
+  });
+  it('dateStringToTimeRange converts to correct timerange', () => {
+    expect(dateStringToTimeRange('2022-04-28')).toEqual('20220428');
+    expect(dateStringToTimeRange('2019-04-01')).toEqual('20190401');
+  });
+  it('timestampHour converts', () => {
+    // Hour conversion
+    setTimezone('UTC');
+    expect(timestampHour(1651057500000)).toEqual(11);
+    setTimezone('CET');
+    expect(timestampHour(1651057500000)).toEqual(13);
+  });
+});