diff --git a/ds3231/ds3231 b/ds3231/ds3231
index 9303fbf..04af54e 160000
--- a/ds3231/ds3231
+++ b/ds3231/ds3231
@@ -1 +1 @@
-Subproject commit 9303fbf5b59bd934ec0c91d5540b851366da92e1
+Subproject commit 04af54e7c8029f05a999f85afa0bcc194f654fed
diff --git a/ds3231/ds3231.cppproj b/ds3231/ds3231.cppproj
index 949d764..0b055a6 100644
--- a/ds3231/ds3231.cppproj
+++ b/ds3231/ds3231.cppproj
@@ -83,17 +83,6 @@
     </custom>
     <AAFDebugger>
       <AAFDebugFiles>
-        <DebugFile>
-          <path>\Debug\ds3231.lss</path>
-          <AAFSetting>
-            <Label>Lss Files</Label>
-            <Extention>.lss</Extention>
-            <Regex>^\s*(?&lt;address&gt;[a-f0-9]*):\s*.*$</Regex>
-            <DebugEnabled>true</DebugEnabled>
-            <RegexGroups>address</RegexGroups>
-            <DebuggerExpression>$pc</DebuggerExpression>
-          </AAFSetting>
-        </DebugFile>
       </AAFDebugFiles>
     </AAFDebugger>
   </PropertyGroup>
@@ -224,12 +213,6 @@
     <Compile Include="ds3231\rtc.h">
       <SubType>compile</SubType>
     </Compile>
-    <Compile Include="ds3231\systime.cpp">
-      <SubType>compile</SubType>
-    </Compile>
-    <Compile Include="ds3231\systime.h">
-      <SubType>compile</SubType>
-    </Compile>
     <Compile Include="ds3231\twi-lowlevel.cpp">
       <SubType>compile</SubType>
     </Compile>
@@ -251,6 +234,12 @@
     <Compile Include="main.cpp">
       <SubType>compile</SubType>
     </Compile>
+    <Compile Include="systime.cpp">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="systime.h">
+      <SubType>compile</SubType>
+    </Compile>
     <Compile Include="type\type.hpp">
       <SubType>compile</SubType>
     </Compile>
diff --git a/ds3231/main.cpp b/ds3231/main.cpp
index 2d335ee..b2e7da5 100644
--- a/ds3231/main.cpp
+++ b/ds3231/main.cpp
@@ -6,7 +6,7 @@
 #include <string.h>
 #include <time.h>
 
-#include "ds3231/systime.h"
+#include "systime.h"
 #include "uart/uart.hpp"
 
 using uart_t = uart::Uart0<>;
diff --git a/ds3231/systime.cpp b/ds3231/systime.cpp
new file mode 100644
index 0000000..315f255
--- /dev/null
+++ b/ds3231/systime.cpp
@@ -0,0 +1,107 @@
+#include "systime.h"
+
+//////////////////////////////////////////////////////////////////////////
+// DST magic by Edgar Bonet
+int SysTime::euDST( const time_t *pTime, int32_t *pZ )
+{
+	static_cast<void>( pZ );
+
+	uint32_t t = *pTime;
+
+	if( static_cast<uint8_t>( t >> 24 ) >= 194 )
+		t -= 3029443200U;
+
+	t = ( t + 655513200 ) / 604800 * 28;
+
+	if( static_cast<uint16_t>( t % 1461 ) < 856 )
+		return ONE_HOUR;
+
+	return 0;
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool SysTime::init()
+{
+	twi_init_master();
+	rtc_init();
+
+	if( !rtc_is_ds3231() )
+		return false;
+
+	set_zone( 1 * ONE_HOUR );
+	set_dst( euDST );
+
+	syncSysTime();
+
+	return true;
+}
+
+//////////////////////////////////////////////////////////////////////////
+void SysTime::syncSysTime()
+{
+	tm sTime = getTime();
+	set_system_time( mk_gmtime( &sTime ) );
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool SysTime::checkSync()
+{
+	time_t timeNow = time( nullptr );
+	tm *ptmUTC = gmtime( &timeNow );
+
+	rtc_tm *ptmRtcTime = rtc_get_time();
+
+	if( ptmUTC->tm_sec != ptmRtcTime->sec || ptmUTC->tm_min != ptmRtcTime->min || ptmUTC->tm_hour != ptmRtcTime->hour )
+		return false;
+
+	if( ptmUTC->tm_mday != ptmRtcTime->mday || ( ptmUTC->tm_mon + 1 ) != ptmRtcTime->mon || ( ptmUTC->tm_year + 1900 ) != ptmRtcTime->year )
+		return false;
+
+	return true;
+}
+
+//////////////////////////////////////////////////////////////////////////
+void SysTime::tick()
+{
+	system_tick();
+}
+
+//////////////////////////////////////////////////////////////////////////
+tm SysTime::getTime()
+{
+	tm sTime;
+	rtc_tm *ptmTime = rtc_get_time();
+
+	sTime.tm_sec = ptmTime->sec;
+	sTime.tm_min = ptmTime->min;
+	sTime.tm_hour = ptmTime->hour;
+	sTime.tm_mday = ptmTime->mday;
+	sTime.tm_mon = ptmTime->mon - 1;
+	sTime.tm_year = ptmTime->year - 1900;
+	sTime.tm_isdst = 0;
+
+	time_t timeUTC = mk_gmtime( &sTime );
+	sTime = *( gmtime( &timeUTC ) );
+
+	return sTime;
+}
+
+//////////////////////////////////////////////////////////////////////////
+void SysTime::setTime( const tm &sTime )
+{
+	rtc_tm *pRtcTime = rtc_get_time();
+	
+	pRtcTime->sec = sTime.tm_sec;
+	pRtcTime->min = sTime.tm_min;
+	pRtcTime->hour = sTime.tm_hour;
+	pRtcTime->mday = sTime.tm_mday;
+	pRtcTime->mon = sTime.tm_mon + 1;
+	pRtcTime->year = sTime.tm_year + 1900;
+	pRtcTime->wday = sTime.tm_wday + 1;
+	pRtcTime->am = ( sTime.tm_hour < 12 ) ? true : false;
+	pRtcTime->twelveHour = ( sTime.tm_hour == 0 ) ? 12 : ( ( sTime.tm_hour > 12 ) ? ( sTime.tm_hour - 12 ) : sTime.tm_hour );
+
+	rtc_set_time( pRtcTime );
+
+	syncSysTime();
+}
\ No newline at end of file
diff --git a/ds3231/systime.h b/ds3231/systime.h
new file mode 100644
index 0000000..af8e0bc
--- /dev/null
+++ b/ds3231/systime.h
@@ -0,0 +1,29 @@
+/*
+* Copyright (c) by BlackMark 2017
+* Date 17/12/2016
+* Version 1.0
+*/
+
+#ifndef SYSTIME_H
+#define SYSTIME_H
+
+#include <time.h>
+
+#include "ds3231/twi.h"
+#include "ds3231/rtc.h"
+
+class SysTime
+{
+private:
+	static int euDST( const time_t *pTime, int32_t *pZ );
+
+public:
+	static bool init();
+	static void syncSysTime();
+	static bool checkSync();
+	static void tick();
+	static tm getTime();
+	static void setTime( const tm &sTime );
+};
+
+#endif
\ No newline at end of file