bugfixing in time handling

include/rtctime.h

@@ -12,8 +12,8 @@
 extern RtcDS3231<TwoWire> Rtc; // make RTC instance globally available
 
 int rtc_init(void);
-int set_rtctime(RtcDateTime t);
 int set_rtctime(uint32_t t);
+int set_rtctime(time_t t);
 void sync_rtctime(void);
 time_t get_rtctime(void);
 float get_rtctemp(void);