Implement software time inaccuracy compensation hack

32768 Hz quartz chrystal resonator tends to be a bit inaccurate giving
about 5-10 seconds per day time skew

simpleclock.ino

@@ -48,6 +48,8 @@ const int min_btn = A1;
 bool dot = true;
 uint8_t minutes;
 uint8_t hours;
+/* time inaccuracy compensation flag */
+uint8_t compflag = 0;
 
 void setup()
 {
@@ -125,6 +127,23 @@ void loop()
 	}
 
 	clock.getTime();
+  /*
+   * Let's implement time compenstion for individual rtc module time
+   * charachteristics. In in my case quartz resonator as inaccurate as
+   * +/- about 5-8 seconds per 24 hours, maybe its require more EMI
+   * sheilding?
+   */
+
+	if ((clock.hour == 21) and (clock.minute == 21) and (clock.second == 21) and (compflag == 0)) {
+		clock.second = 14;
+		clock.fillByHMS(clock.hour,clock.minute,clock.second);
+		clock.setTime();
+		compflag = 1;
+	}
+
+	if ((clock.hour == 21) and (clock.minute == 21) and (clock.second == 23) and (compflag == 1)) {
+		compflag = 0;
+	}
 
 	// make blinking dot
 	if (clock.hour > 0)