diff --git a/.gitmodules b/.gitmodules
index a89dd6c..b854bdc 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,3 +16,6 @@
 [submodule "ds3231/i2c"]
 	path = ds3231/i2c
 	url = git@git.blackmark.me:avr/i2c.git
+[submodule "ds3231/util"]
+	path = ds3231/util
+	url = git@git.blackmark.me:avr/util.git
diff --git a/ds3231/ds3231 b/ds3231/ds3231
index 54b8917..11211be 160000
--- a/ds3231/ds3231
+++ b/ds3231/ds3231
@@ -1 +1 @@
-Subproject commit 54b8917705125bdea47f74e4c911650da5bb025f
+Subproject commit 11211be9b9b823c73c20b5b419e3ff7b82b48e3e
diff --git a/ds3231/ds3231.cppproj b/ds3231/ds3231.cppproj
index 26e8f21..ad5d203 100644
--- a/ds3231/ds3231.cppproj
+++ b/ds3231/ds3231.cppproj
@@ -275,12 +275,19 @@
     <Compile Include="uart\uart.hpp">
       <SubType>compile</SubType>
     </Compile>
+    <Compile Include="util\func.hpp">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="util\util.hpp">
+      <SubType>compile</SubType>
+    </Compile>
   </ItemGroup>
   <ItemGroup>
     <Folder Include="ds3231" />
     <Folder Include="io" />
     <Folder Include="flash" />
     <Folder Include="i2c" />
+    <Folder Include="util" />
     <Folder Include="uart" />
     <Folder Include="type" />
   </ItemGroup>
diff --git a/ds3231/i2c b/ds3231/i2c
index ff131d9..8af5afd 160000
--- a/ds3231/i2c
+++ b/ds3231/i2c
@@ -1 +1 @@
-Subproject commit ff131d92a1b8e92efc2ae24306d7b7cac3cfb28a
+Subproject commit 8af5afd00d1cba9211e4fe9be1df44a14b7973a1
diff --git a/ds3231/main.cpp b/ds3231/main.cpp
index 774d247..9f4e982 100644
--- a/ds3231/main.cpp
+++ b/ds3231/main.cpp
@@ -140,6 +140,16 @@ int main()
 	cSerial.init();
 	sei();
 
+	rtc::DateTime date;
+	date.year = 2020;
+	date.month = 5;
+	date.day = 16;
+	date.hour = 17;
+	date.minute = 24;
+	date.second = 10;
+
+	ds3231.setDateTime(date);
+
 	setup();
 
 	while (true) {
diff --git a/ds3231/type b/ds3231/type
index 65d8928..01fad90 160000
--- a/ds3231/type
+++ b/ds3231/type
@@ -1 +1 @@
-Subproject commit 65d8928ff458aceb74ac44f214427f3ea8eaefc1
+Subproject commit 01fad9046ea3125e47ff3ed0e97f098759265f3e
diff --git a/ds3231/util b/ds3231/util
new file mode 160000
index 0000000..d045bbf
--- /dev/null
+++ b/ds3231/util
@@ -0,0 +1 @@
+Subproject commit d045bbffc3338a747bafc58db444f1aa70efd221