diff --git a/common/base-server.nix b/common/base-server.nix
index c3f0251..5206fea 100644
--- a/common/base-server.nix
+++ b/common/base-server.nix
@@ -55,4 +55,6 @@
     "en_US.UTF-8/UTF-8"
     "fr_FR.UTF-8/UTF-8"
   ];
+
+  time.timeZone = "UTC";
 }
diff --git a/hosts/buildbot/default.nix b/hosts/buildbot/default.nix
index ffc07c0..52df6eb 100755
--- a/hosts/buildbot/default.nix
+++ b/hosts/buildbot/default.nix
@@ -9,8 +9,6 @@
   # TODO: make it the default
   networking.domain = "infra.forkos.org";
 
-  time.timeZone = "Europe/Paris";
-
   bagel.sysadmin.enable = true;
   # Buildbot is proxied.
   bagel.raito.v6-proxy-awareness.enable = true;
diff --git a/hosts/fodwatch/default.nix b/hosts/fodwatch/default.nix
index 93f4864..52d15c5 100755
--- a/hosts/fodwatch/default.nix
+++ b/hosts/fodwatch/default.nix
@@ -8,8 +8,6 @@
   networking.hostName = "fodwatch";
   networking.domain = "infra.forkos.org";
 
-  time.timeZone = "Europe/Paris";
-
   bagel.sysadmin.enable = true;
   # Fodwatch will be proxied.
   bagel.raito.v6-proxy-awareness.enable = true;
diff --git a/hosts/gerrit01/default.nix b/hosts/gerrit01/default.nix
index 7dc7de9..a9c48b4 100755
--- a/hosts/gerrit01/default.nix
+++ b/hosts/gerrit01/default.nix
@@ -9,8 +9,6 @@
   # TODO: make it the default
   networking.domain = "infra.forkos.org";
 
-  time.timeZone = "Europe/Paris";
-
   bagel.sysadmin.enable = true;
   # Gerrit is proxied.
   bagel.raito.v6-proxy-awareness.enable = true;
diff --git a/hosts/git/default.nix b/hosts/git/default.nix
index 4399485..57c917a 100644
--- a/hosts/git/default.nix
+++ b/hosts/git/default.nix
@@ -8,8 +8,6 @@ in
   networking.hostName = "git";
   networking.domain = "infra.forkos.org";
 
-  time.timeZone = "Europe/Paris";
-
   bagel.sysadmin.enable = true;
   # Forgejo will be proxied.
   bagel.raito.v6-proxy-awareness.enable = true;
diff --git a/hosts/meta01/default.nix b/hosts/meta01/default.nix
index 21c02f5..a5abb80 100755
--- a/hosts/meta01/default.nix
+++ b/hosts/meta01/default.nix
@@ -2,8 +2,6 @@
   networking.hostName = "meta01";
   networking.domain = "infra.forkos.org";
 
-  time.timeZone = "Europe/Paris";
-
   bagel.sysadmin.enable = true;
   # netbox is proxied.
   bagel.raito.v6-proxy-awareness.enable = true;
diff --git a/hosts/public01/default.nix b/hosts/public01/default.nix
index ffbce98..d1d3798 100755
--- a/hosts/public01/default.nix
+++ b/hosts/public01/default.nix
@@ -9,8 +9,6 @@
   # TODO: make it the default
   networking.domain = "infra.forkos.org";
 
-  time.timeZone = "Europe/Paris";
-
   bagel.sysadmin.enable = true;
   # Buildbot is proxied.
   bagel.raito.v6-proxy-awareness.enable = true;