diff --git a/STM32F1/libraries/RTClock/src/RTClock.cpp b/STM32F1/libraries/RTClock/src/RTClock.cpp
old mode 100644
new mode 100755
diff --git a/STM32F1/libraries/RTClock/src/RTClock.h b/STM32F1/libraries/RTClock/src/RTClock.h
old mode 100644
new mode 100755
index 4d8399e..71015a5
--- a/STM32F1/libraries/RTClock/src/RTClock.h
+++ b/STM32F1/libraries/RTClock/src/RTClock.h
@@ -71,8 +71,12 @@ class RTClock {
 	uint8_t minute(time_t t)  { breakTime(t, tmm); return tmm.minute; }
 	uint8_t second(time_t t)  { breakTime(t, tmm); return tmm.second; }
 	uint8_t isPM(time_t t)    { return (hour(t)>=12); }
+
+	// Usage: localtime = TimeZone(UnixTime, 8); 
+	time_t TimeZone(time_t t, int TZ) { return ( t + (TZ * SECS_PER_HOUR)); } 
 	
-	time_t TimeZone(time_t t, int TZ)  { return ( t + (TZ * SECS_PER_HOUR)); }    // usage: localtime = TimeZone(UnixTime, 8); // Beijing timezone = 8  
+	// Usage:  1.  localtime = TimeZone(UnixTime, 9, 45)  ->   UTC +09:45 TimeZone; 
+	time_t TimeZone(time_t t, int HTZ, int MTZ)  { return ( t + (HTZ * SECS_PER_HOUR) + (MTZ * 60)); }    // HTZ = Hour offset, MTZ = Minute offset
 	
 	void createAlarm(voidFuncPtr function, time_t alarm_time_t); 
 	void createAlarm(voidFuncPtr function, struct tm_t & alarm_tm);