diff --git a/src/timedate.cpp b/src/timedate.cpp
index e6ec83f..c7c2406 100644
--- a/src/timedate.cpp
+++ b/src/timedate.cpp
@@ -45,6 +45,30 @@ static void slack_method_call(const Glib::RefPtr<Gio::DBus::Connection>& connect
             invocation->return_error(Gio::DBus::Error{ Gio::DBus::Error::FAILED, filesystem_error.what() });
         }
     }
+    else if (method_name == "SetLocalRTC")
+    {
+        Glib::Variant<bool> local_rtc;
+        Glib::Variant<bool> fix_system;
+        Glib::Variant<bool> user_interaction;
+
+        parameters.get_child(local_rtc, 0);
+        parameters.get_child(fix_system, 1);
+        parameters.get_child(user_interaction, 2);
+
+        try
+        {
+            dlackware::timedate::set_local_rtc(local_rtc.get(), fix_system.get(), user_interaction.get());
+            invocation->return_value(Glib::VariantContainerBase());
+        }
+        catch (const std::system_error& error)
+        {
+            invocation->return_error(Gio::DBus::Error{ Gio::DBus::Error::FAILED, error.what() });
+        }
+        catch (const Glib::SpawnError& spawn_error)
+        {
+            invocation->return_error(Gio::DBus::Error{ Gio::DBus::Error::FAILED, spawn_error.what() });
+        }
+    }
     else if (method_name == "SetTime")
     {
         Glib::Variant<gint64> usec_utc;
@@ -285,6 +309,37 @@ namespace dlackware::timedate
         }
     }
 
+    void set_local_rtc(bool local_rtc, bool fix_system, bool)
+    {
+        std::ofstream hardwareclock{ "/etc/hardwareclock", std::ios::trunc };
+        std::string hwclock_argument;
+
+        hardwareclock << "# /etc/hardwareclock" << std::endl
+            << "#" << std::endl
+            << "# Tells how the hardware clock time is stored." << std::endl
+            << "# You should run timeconfig to edit this file." << std::endl
+            << std::endl;
+
+        if (local_rtc)
+        {
+            hwclock_argument = "--localtime";
+            hardwareclock << "localtime";
+        }
+        else
+        {
+            hwclock_argument = "--utc";
+            hardwareclock << "UTC";
+        }
+        hardwareclock << std::endl;
+
+        if (!fix_system)
+        {
+            Glib::spawn_sync("", std::vector<std::string>{ "/sbin/hwclock", hwclock_argument, "--hctosys" },
+                    Glib::SpawnFlags::SPAWN_STDOUT_TO_DEV_NULL | Glib::SpawnFlags::SPAWN_STDERR_TO_DEV_NULL,
+                    {}, nullptr, nullptr, static_cast<int *>(nullptr));
+        }
+    }
+
     bool local_rtc()
     {
         std::ifstream fh{ "/etc/hardwareclock", std::ios::in };
diff --git a/src/timedate.h b/src/timedate.h
index 1c33594..a1b2852 100644
--- a/src/timedate.h
+++ b/src/timedate.h
@@ -65,6 +65,9 @@ namespace dlackware::timedate
     // Throws std::system_error.
     void set_time(std::int64_t seconds_since_epoch, bool relative, bool user_interaction);
 
+    // Controls whether the RTC is local time or UTC.
+    void set_local_rtc(bool local_rtc, bool fix_system, bool user_interaction);
+
     class timedate1
     {
         const Gio::DBus::InterfaceVTable interface_vtable;