diff --git a/Dockerfile b/Dockerfile
index 873e72c..5fca3e4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,14 @@
 FROM ubuntu:artful
 
+RUN ln -snf /usr/share/zoneinfo/Europe/Vienna /etc/localtime && echo Europe/Vienna > /etc/timezone
+
+RUN apt update \
+ && apt install tzdata -y \
+ && rm /var/lib/apt/lists/* /var/log/* -Rf
+
 RUN apt update \
  && apt install git-core g++ make qt5-default qtmultimedia5-dev qttools5-dev qttools5-dev-tools -y \
- && rm /var/lib/apt/lists/* -Rf
+ && rm /var/lib/apt/lists/* /var/log/* -Rf
 
 ADD . /tmp/QtZeiterfassung
 
@@ -15,9 +21,15 @@ RUN mkdir -p /tmp/build_QtZeiterfassung \
 
 FROM ubuntu:artful
 
+RUN ln -snf /usr/share/zoneinfo/Europe/Vienna /etc/localtime && echo Europe/Vienna > /etc/timezone
+
+RUN apt update \
+ && apt install tzdata -y \
+ && rm /var/lib/apt/lists/* /var/log/* -Rf
+
 RUN apt update \
  && apt install libssl1.0.0 ca-certificates libqt5core5a libqt5gui5 libqt5network5 libqt5multimedia5 -y \
- && rm /var/lib/apt/lists/* -Rf
+ && rm /var/lib/apt/lists/* /var/log/* -Rf
 
 COPY --from=0 /tmp/build_QtZeiterfassung/bin /root/bin