Added missing - 2000 for dateTime.

The set needs to be more aware of the differences in both RTCs, 1900 for the DS3231 and 2000 for the PCF8563, will work on getting those calculations done shortly.

src/WatchyRTC.cpp

@@ -105,7 +105,7 @@ void WatchyRTC::_PCFConfig(String datetime){
         int Minute = _getValue(datetime, ':', 4).toInt();
         int Second = _getValue(datetime, ':', 5).toInt();
         //day, weekday, month, century(1=1900, 0=2000), year(0-99)
-        rtc_pcf.setDate(Day, _getDayOfWeek(Day, Month, Year), Month, 0, Year);//offset from 2000
+        rtc_pcf.setDate(Day, _getDayOfWeek(Day, Month, Year), Month, 0, Year - 2000);//offset from 2000 only for the year set.
         //hr, min, sec
         rtc_pcf.setTime(Hour, Minute, Second);
     }