diff --git a/core/admin/Dockerfile b/core/admin/Dockerfile
index a4f28481..8dda76d2 100644
--- a/core/admin/Dockerfile
+++ b/core/admin/Dockerfile
@@ -23,9 +23,11 @@ RUN set -eu \
 FROM $DISTRO
 COPY --from=balenalib/rpi-alpine:3.14 /usr/bin/qemu-arm-static /usr/bin/qemu-arm-static
 
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN set -eu \
- && apk add --no-cache python3 py3-pip git bash \
+ && apk add --no-cache python3 py3-pip git bash tzdata \
  && pip3 install --upgrade pip
 
 RUN mkdir -p /app
diff --git a/core/admin/mailu/configuration.py b/core/admin/mailu/configuration.py
index 9829f798..54856c09 100644
--- a/core/admin/mailu/configuration.py
+++ b/core/admin/mailu/configuration.py
@@ -72,6 +72,7 @@ DEFAULT_CONFIG = {
     'SESSION_LIFETIME': 24,
     'SESSION_COOKIE_SECURE': True,
     'CREDENTIAL_ROUNDS': 12,
+    'TZ': 'Etc/UTC',
     # Host settings
     'HOST_IMAP': 'imap',
     'HOST_LMTP': 'imap:2525',
diff --git a/core/dovecot/Dockerfile b/core/dovecot/Dockerfile
index 49fcb866..7a2dbdc1 100644
--- a/core/dovecot/Dockerfile
+++ b/core/dovecot/Dockerfile
@@ -11,9 +11,12 @@ RUN git clone https://github.com/grosjo/fts-xapian.git \
   && make install
 
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip git bash py3-multidict py3-yarl \
+    python3 py3-pip git bash py3-multidict py3-yarl tzdata \
   && pip3 install --upgrade pip
 
 # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube
diff --git a/core/nginx/Dockerfile b/core/nginx/Dockerfile
index b7e5e22e..d8899144 100644
--- a/core/nginx/Dockerfile
+++ b/core/nginx/Dockerfile
@@ -1,5 +1,8 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash py3-multidict \
@@ -9,7 +12,7 @@ RUN apk add --no-cache \
 RUN pip3 install socrate==0.2.0
 
 # Image specific layers under this line
-RUN apk add --no-cache certbot nginx nginx-mod-mail openssl curl \
+RUN apk add --no-cache certbot nginx nginx-mod-mail openssl curl tzdata \
  && pip3 install watchdog
 
 COPY conf /conf
diff --git a/core/postfix/Dockerfile b/core/postfix/Dockerfile
index bdf45e35..9f0cc701 100644
--- a/core/postfix/Dockerfile
+++ b/core/postfix/Dockerfile
@@ -1,8 +1,11 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip git bash py3-multidict py3-yarl \
+    python3 py3-pip git bash py3-multidict py3-yarl tzdata \
   && pip3 install --upgrade pip
 
 # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube
diff --git a/core/rspamd/Dockerfile b/core/rspamd/Dockerfile
index 0b3b94f7..33174c1a 100644
--- a/core/rspamd/Dockerfile
+++ b/core/rspamd/Dockerfile
@@ -1,8 +1,11 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip git bash py3-multidict \
+    python3 py3-pip git bash py3-multidict tzdata \
   && pip3 install --upgrade pip
 
 # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube
diff --git a/docs/configuration.rst b/docs/configuration.rst
index fa574415..03817988 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -194,6 +194,10 @@ The ``LETSENCRYPT_SHORTCHAIN`` (default: False) setting controls whether we send
 
 The ``REAL_IP_HEADER`` (default: unset) and ``REAL_IP_FROM`` (default: unset) settings controls whether HTTP headers such as ``X-Forwarded-For`` or ``X-Real-IP`` should be trusted. The former should be the name of the HTTP header to extract the client IP address from and the later a comma separated list of IP addresses designing which proxies to trust. If you are using Mailu behind a reverse proxy, you should set both. Setting the former without the later introduces a security vulnerability allowing a potential attacker to spoof his source address.
 
+The ``TZ`` sets the timezone Mailu will use. The timezone naming convention usually uses a ``Region/City`` format. See `TZ database name`_  for a list of valid timezones This defaults to ``Etc/UTC``. Warning: if you are observing different timestamps in your log files you should change your hosts timezone to UTC instead of changing TZ to your local timezone. Using UTC allows easy log correlation with remote MTAs.
+
+.. _`TZ database name`: https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+
 Antivirus settings
 ------------------
 
diff --git a/optional/clamav/Dockerfile b/optional/clamav/Dockerfile
index efad01ad..e17d2d70 100644
--- a/optional/clamav/Dockerfile
+++ b/optional/clamav/Dockerfile
@@ -1,8 +1,11 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip bash \
+    python3 py3-pip bash tzdata \
   && pip3 install --upgrade pip
 # Image specific layers under this line
 RUN apk add --no-cache clamav rsyslog wget clamav-libunrar
diff --git a/optional/fetchmail/Dockerfile b/optional/fetchmail/Dockerfile
index d3397a22..995ec48f 100644
--- a/optional/fetchmail/Dockerfile
+++ b/optional/fetchmail/Dockerfile
@@ -1,9 +1,11 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
 
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip bash \
+    python3 py3-pip bash tzdata \
   && pip3 install --upgrade pip
 
 # Image specific layers under this line
diff --git a/optional/postgresql/Dockerfile b/optional/postgresql/Dockerfile
index ab197b62..3ddbb40a 100644
--- a/optional/postgresql/Dockerfile
+++ b/optional/postgresql/Dockerfile
@@ -1,8 +1,11 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip bash py3-multidict \
+    python3 py3-pip bash py3-multidict tzdata \
   && pip3 install --upgrade pip
 
 # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube
diff --git a/optional/radicale/Dockerfile b/optional/radicale/Dockerfile
index 21c1d437..4eb8d5a7 100644
--- a/optional/radicale/Dockerfile
+++ b/optional/radicale/Dockerfile
@@ -1,9 +1,11 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
 
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip bash \
+    python3 py3-pip bash tzdata \
   && pip3 install --upgrade pip
 
 # Image specific layers under this line
diff --git a/optional/traefik-certdumper/Dockerfile b/optional/traefik-certdumper/Dockerfile
index a7127ce1..506c09c2 100644
--- a/optional/traefik-certdumper/Dockerfile
+++ b/optional/traefik-certdumper/Dockerfile
@@ -1,6 +1,8 @@
 FROM ldez/traefik-certs-dumper
 
-RUN apk --no-cache add inotify-tools util-linux bash
+ENV TZ Etc/UTC
+
+RUN apk --no-cache add inotify-tools util-linux bash tzdata
 
 COPY run.sh /
 
diff --git a/optional/unbound/Dockerfile b/optional/unbound/Dockerfile
index da979496..bf5d4840 100644
--- a/optional/unbound/Dockerfile
+++ b/optional/unbound/Dockerfile
@@ -1,8 +1,11 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip git bash py3-multidict \
+    python3 py3-pip git bash py3-multidict tzdata \
   && pip3 install --upgrade pip
 
 # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube
diff --git a/setup/flavors/compose/mailu.env b/setup/flavors/compose/mailu.env
index 3e53e7d2..a8709ab3 100644
--- a/setup/flavors/compose/mailu.env
+++ b/setup/flavors/compose/mailu.env
@@ -170,6 +170,9 @@ REJECT_UNLISTED_RECIPIENT={{ reject_unlisted_recipient }}
 # Log level threshold in start.py (value: CRITICAL, ERROR, WARNING, INFO, DEBUG, NOTSET)
 LOG_LEVEL=WARNING
 
+# Timezone for the Mailu containers. See this link for all possible values https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+TZ=Etc/UTC
+
 ###################################
 # Database settings
 ###################################
diff --git a/towncrier/newsfragments/1154.enhancement b/towncrier/newsfragments/1154.enhancement
new file mode 100644
index 00000000..d19b3d09
--- /dev/null
+++ b/towncrier/newsfragments/1154.enhancement
@@ -0,0 +1 @@
+Add support for timezones
\ No newline at end of file
diff --git a/webmails/rainloop/Dockerfile b/webmails/rainloop/Dockerfile
index f1394d64..02910e39 100644
--- a/webmails/rainloop/Dockerfile
+++ b/webmails/rainloop/Dockerfile
@@ -4,9 +4,11 @@ ARG ARCH=""
 FROM ${ARCH}alpine:3.14
 ONBUILD COPY --from=balenalib/rpi-alpine:3.14 /usr/bin/qemu-arm-static /usr/bin/qemu-arm-static
 
+ENV TZ Etc/UTC
+
 # Shared later between dovecot postfix nginx rspamd rainloop and roundloop
 RUN apk add --no-cache \
-    python3 py3-pip \
+    python3 py3-pip tzdata \
  && pip3 install socrate==0.2.0
 
 #  https://www.rainloop.net/docs/system-requirements/
diff --git a/webmails/roundcube/Dockerfile b/webmails/roundcube/Dockerfile
index b73b9e44..59527af8 100644
--- a/webmails/roundcube/Dockerfile
+++ b/webmails/roundcube/Dockerfile
@@ -8,6 +8,8 @@ FROM ${ARCH}php:8.0-apache as build_other
 
 FROM build_${QEMU}
 
+ENV TZ Etc/UTC
+
 RUN set -eu \
  && apt update \
  && echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections \
@@ -39,8 +41,6 @@ ENV ROUNDCUBE_URL https://github.com/roundcube/roundcubemail/releases/download/1
 
 ENV CARDDAV_URL https://github.com/mstilkerich/rcmcarddav/releases/download/v4.2.2/carddav-v4.2.2.tar.gz
 
-ENV TZ Etc/UTC
-
 RUN set -eu \
  && rm -rf /var/www/html/ \
  && cd /var/www \
diff --git a/webmails/roundcube/php.ini b/webmails/roundcube/php.ini
index 3e77a4e5..dafa0578 100644
--- a/webmails/roundcube/php.ini
+++ b/webmails/roundcube/php.ini
@@ -1,4 +1,4 @@
 expose_php=Off
+date.timezone={{ TZ }}
 upload_max_filesize = {{ MAX_FILESIZE }}M
 post_max_size = {{ MAX_FILESIZE }}M
-