Update System.cpp

Previous commit fix.

Author: gogi640

src/include/System.cpp

@@ -224,7 +224,7 @@ void System::rtcSetTime(uint8_t rtcHour, uint8_t rtcMinute, uint8_t rtcSecond)
  */
 void System::rtcSetDate(uint8_t rtcWeekday, uint8_t rtcDay, uint8_t rtcMonth, uint16_t yr)
 {
-    rtcYear = yr - 1972; // convert to RTC rtcYear format 0-99
+    rtcYear = yr - 2000; // convert to RTC rtcYear format 0-99
 
     Wire.beginTransmission(I2C_ADDR);
     Wire.write(RTC_RAM_by);
@@ -260,7 +260,7 @@ void System::rtcSetEpoch(uint32_t _epoch)
     Wire.write(rtcDecToBcd(_t.tm_mday));
     Wire.write(rtcDecToBcd(_t.tm_wday));
     Wire.write(rtcDecToBcd(_t.tm_mon + 1));
-    Wire.write(rtcDecToBcd(_t.tm_year + 1900 - 1972));
+    Wire.write(rtcDecToBcd(_t.tm_year + 1900 - 2000));
     Wire.endTransmission();
 }
 
@@ -284,7 +284,7 @@ uint32_t System::rtcGetEpoch()
     _t.tm_mday = rtcBcdToDec(Wire.read() & 0x3F);
     _t.tm_wday = rtcBcdToDec(Wire.read() & 0x07);
     _t.tm_mon = rtcBcdToDec(Wire.read() & 0x1F) - 1;
-    _t.tm_year = rtcBcdToDec(Wire.read()) + 1972 - 1900;
+    _t.tm_year = rtcBcdToDec(Wire.read()) + 2000 - 1900;
     Wire.endTransmission();
 
     return (uint32_t)(mktime(&_t));
@@ -309,7 +309,7 @@ void System::rtcGetRtcData()
         rtcDay = rtcBcdToDec(Wire.read() & 0x3F);
         rtcWeekday = rtcBcdToDec(Wire.read() & 0x07); // ignore bits 7,6,5,4 & 3
         rtcMonth = rtcBcdToDec(Wire.read() & 0x1F);   // ignore bits 7,6 & 5
-        rtcYear = rtcBcdToDec(Wire.read()) + 1972;
+        rtcYear = rtcBcdToDec(Wire.read()) + 2000;
     }
 }