diff --git a/Userland/Applications/AnalogClock/main.cpp b/Userland/Applications/AnalogClock/main.cpp
index 719103410e..426d84a5f6 100644
--- a/Userland/Applications/AnalogClock/main.cpp
+++ b/Userland/Applications/AnalogClock/main.cpp
@@ -14,6 +14,7 @@
 #include <LibGUI/Menubar.h>
 #include <LibGUI/Window.h>
 #include <LibMain/Main.h>
+#include <time.h>
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
@@ -24,6 +25,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
+    tzset();
+
     auto app_icon = TRY(GUI::Icon::try_create_default_icon("app-analog-clock"));
     auto window = TRY(GUI::Window::try_create());
     window->set_title(Core::DateTime::now().to_string("%Y-%m-%d"));
diff --git a/Userland/Applications/Browser/main.cpp b/Userland/Applications/Browser/main.cpp
index 413bb68059..cbba6d7552 100644
--- a/Userland/Applications/Browser/main.cpp
+++ b/Userland/Applications/Browser/main.cpp
@@ -21,6 +21,7 @@
 #include <LibGUI/Icon.h>
 #include <LibGUI/TabWidget.h>
 #include <LibMain/Main.h>
+#include <time.h>
 #include <unistd.h>
 
 namespace Browser {
@@ -82,6 +83,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::unveil("/tmp/portal/request", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
+    tzset();
+
     auto app_icon = GUI::Icon::default_icon("app-browser");
 
     Browser::g_home_url = Config::read_string("Browser", "Preferences", "Home", "file:///res/html/misc/welcome.html");
diff --git a/Userland/Applications/Calendar/main.cpp b/Userland/Applications/Calendar/main.cpp
index 57aceb613e..3270a8ac4f 100644
--- a/Userland/Applications/Calendar/main.cpp
+++ b/Userland/Applications/Calendar/main.cpp
@@ -19,6 +19,7 @@
 #include <LibGUI/Toolbar.h>
 #include <LibGUI/Window.h>
 #include <LibMain/Main.h>
+#include <time.h>
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
@@ -31,6 +32,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
+    tzset();
+
     auto app_icon = TRY(GUI::Icon::try_create_default_icon("app-calendar"));
     auto window = TRY(GUI::Window::try_create());
     window->set_title("Calendar");
diff --git a/Userland/Services/RequestServer/main.cpp b/Userland/Services/RequestServer/main.cpp
index c9b1884b63..9972401f5f 100644
--- a/Userland/Services/RequestServer/main.cpp
+++ b/Userland/Services/RequestServer/main.cpp
@@ -16,6 +16,7 @@
 #include <RequestServer/HttpProtocol.h>
 #include <RequestServer/HttpsProtocol.h>
 #include <signal.h>
+#include <time.h>
 
 ErrorOr<int> serenity_main(Main::Arguments)
 {
@@ -32,6 +33,8 @@ ErrorOr<int> serenity_main(Main::Arguments)
     TRY(Core::System::unveil("/etc/timezone", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
+    tzset();
+
     [[maybe_unused]] auto gemini = make<RequestServer::GeminiProtocol>();
     [[maybe_unused]] auto http = make<RequestServer::HttpProtocol>();
     [[maybe_unused]] auto https = make<RequestServer::HttpsProtocol>();
diff --git a/Userland/Services/Taskbar/ClockWidget.h b/Userland/Services/Taskbar/ClockWidget.h
index da9962486b..0e8eafae54 100644
--- a/Userland/Services/Taskbar/ClockWidget.h
+++ b/Userland/Services/Taskbar/ClockWidget.h
@@ -30,7 +30,11 @@ private:
     virtual void paint_event(GUI::PaintEvent&) override;
     virtual void mousedown_event(GUI::MouseEvent&) override;
 
-    void tick_clock() { update(); }
+    void tick_clock()
+    {
+        tzset();
+        update();
+    }
 
     void open();
     void close();
diff --git a/Userland/Services/WebContent/main.cpp b/Userland/Services/WebContent/main.cpp
index 2c51f2f761..02d04d4786 100644
--- a/Userland/Services/WebContent/main.cpp
+++ b/Userland/Services/WebContent/main.cpp
@@ -10,6 +10,7 @@
 #include <LibIPC/SingleServer.h>
 #include <LibMain/Main.h>
 #include <WebContent/ClientConnection.h>
+#include <time.h>
 
 ErrorOr<int> serenity_main(Main::Arguments)
 {
@@ -22,6 +23,8 @@ ErrorOr<int> serenity_main(Main::Arguments)
     TRY(Core::System::unveil("/tmp/portal/websocket", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
+    tzset();
+
     auto client = TRY(IPC::take_over_accepted_client_from_system_server<WebContent::ClientConnection>());
     return event_loop.exec();
 }
diff --git a/Userland/Utilities/date.cpp b/Userland/Utilities/date.cpp
index 12d6bae420..28ae833449 100644
--- a/Userland/Utilities/date.cpp
+++ b/Userland/Utilities/date.cpp
@@ -29,6 +29,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     args_parser.add_option(print_rfc_5322, "Print date in RFC 5322 format", "rfc-5322", 'R');
     args_parser.parse(arguments);
 
+    tzset();
+
     if (set_date != nullptr) {
         auto number = String(set_date).to_uint();
 
diff --git a/Userland/Utilities/ddate.cpp b/Userland/Utilities/ddate.cpp
index 9e7d8ce66b..e6f5c3c63a 100644
--- a/Userland/Utilities/ddate.cpp
+++ b/Userland/Utilities/ddate.cpp
@@ -8,6 +8,7 @@
 #include <LibCore/DateTime.h>
 #include <LibCore/System.h>
 #include <LibMain/Main.h>
+#include <time.h>
 #include <unistd.h>
 
 class DiscordianDate {
@@ -104,6 +105,8 @@ ErrorOr<int> serenity_main(Main::Arguments)
 {
     TRY(Core::System::pledge("stdio rpath"));
 
+    tzset();
+
     auto date = Core::DateTime::now();
     outln("Today is {}", DiscordianDate(date).to_string());
 
diff --git a/Userland/Utilities/fortune.cpp b/Userland/Utilities/fortune.cpp
index 324ec17874..5d5aac3641 100644
--- a/Userland/Utilities/fortune.cpp
+++ b/Userland/Utilities/fortune.cpp
@@ -17,6 +17,7 @@
 #include <LibMain/Main.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <time.h>
 #include <unistd.h>
 
 class Quote {
@@ -87,6 +88,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::unveil("/etc/timezone", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
+    tzset();
+
     auto file_contents = file->read_all();
     auto json = TRY(JsonValue::from_string(file_contents));
     if (!json.is_array()) {
diff --git a/Userland/Utilities/js.cpp b/Userland/Utilities/js.cpp
index c77c563f80..66bec4ccb7 100644
--- a/Userland/Utilities/js.cpp
+++ b/Userland/Utilities/js.cpp
@@ -68,6 +68,7 @@
 #include <fcntl.h>
 #include <signal.h>
 #include <stdio.h>
+#include <time.h>
 #include <unistd.h>
 
 RefPtr<JS::VM> vm;
@@ -1287,6 +1288,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     args_parser.add_positional_argument(script_paths, "Path to script files", "scripts", Core::ArgsParser::Required::No);
     args_parser.parse(arguments);
 
+    tzset();
+
     bool syntax_highlight = !disable_syntax_highlight;
 
     vm = JS::VM::create();
diff --git a/Userland/Utilities/w.cpp b/Userland/Utilities/w.cpp
index 2d4ed240f1..f59d7fc888 100644
--- a/Userland/Utilities/w.cpp
+++ b/Userland/Utilities/w.cpp
@@ -25,6 +25,8 @@ ErrorOr<int> serenity_main(Main::Arguments)
     TRY(Core::System::unveil("/proc", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
+    tzset();
+
     auto file = TRY(Core::File::open("/var/run/utmp", Core::OpenMode::ReadOnly));
     auto json = TRY(JsonValue::from_string(file->read_all()));
     if (!json.is_object()) {