Matrix-Zeitzone konfigurierbar machen (Default Europe/Berlin)

cmd/server/matrix.go

@@ -21,6 +21,7 @@ type MatrixClient struct {
 	AccessToken   string
 	RoomID        string
 	Limit         int
+	TimeLocation  *time.Location
 	httpClient    *http.Client
 	crypto        *cryptohelper.CryptoHelper
 }
@@ -50,6 +51,12 @@ func newMatrixClientFromEnv() *MatrixClient {
 			Timeout: 8 * time.Second,
 		},
 	}
+	locName := strings.TrimSpace(readEnv("MATRIX_TIMEZONE", "Europe/Berlin"))
+	if loc, err := time.LoadLocation(locName); err == nil {
+		m.TimeLocation = loc
+	} else {
+		m.TimeLocation = time.Local
+	}
 
 	if readEnv("MATRIX_ENABLE_CRYPTO", "1") != "0" {
 		m.crypto = initMatrixCrypto(hs, token)
@@ -128,7 +135,7 @@ func (m *MatrixClient) FetchRecentMessages(ctx context.Context) ([]MatrixMessage
 }
 
 func (m *MatrixClient) mapEventToMessage(ctx context.Context, ev *event.Event) (MatrixMessage, bool) {
-	ts := time.UnixMilli(ev.Timestamp).Local().Format("02.01.2006 15:04")
+	ts := m.formatTimestamp(ev.Timestamp)
 	sender := shortMatrixSender(string(ev.Sender))
 
 	switch ev.Type {
@@ -152,6 +159,14 @@ func (m *MatrixClient) mapEventToMessage(ctx context.Context, ev *event.Event) (
 	}
 }
 
+func (m *MatrixClient) formatTimestamp(tsMillis int64) string {
+	loc := m.TimeLocation
+	if loc == nil {
+		loc = time.Local
+	}
+	return time.UnixMilli(tsMillis).In(loc).Format("02.01.2006 15:04")
+}
+
 func extractBody(ev *event.Event) (string, bool) {
 	if ev == nil {
 		return "", false