Arduino: 1.8.13 (Windows 10), Board: "Seeeduino V4(Atmega328P)" In file included from Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:28:0: D:\Arduino\libraries\RTC\src/RTC.h:42:7: error: redefinition of 'class DateTime' class DateTime { ^~~~~~~~ In file included from D:\Arduino\libraries\RTC\src/PCF8563.h:10:0, from Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:27: D:\Arduino\libraries\RTC\src/RTC.h:42:7: note: previous definition of 'class DateTime' class DateTime { ^~~~~~~~ In file included from Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:28:0: D:\Arduino\libraries\RTC\src/RTC.h:60:7: error: redefinition of 'class DS1307' class DS1307 ^~~~~~ In file included from D:\Arduino\libraries\RTC\src/PCF8563.h:10:0, from Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:27: D:\Arduino\libraries\RTC\src/RTC.h:60:7: note: previous definition of 'class DS1307' class DS1307 ^~~~~~ In file included from Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:28:0: D:\Arduino\libraries\RTC\src/RTC.h:108:7: error: redefinition of 'class NVRAM' class NVRAM ^~~~~ In file included from D:\Arduino\libraries\RTC\src/PCF8563.h:10:0, from Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:27: D:\Arduino\libraries\RTC\src/RTC.h:108:7: note: previous definition of 'class NVRAM' class NVRAM ^~~~~ In file included from Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:28:0: D:\Arduino\libraries\RTC\src/RTC.h:127:7: error: redefinition of 'class DS3231' class DS3231 { ^~~~~~ In file included from D:\Arduino\libraries\RTC\src/PCF8563.h:10:0, from Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:27: D:\Arduino\libraries\RTC\src/RTC.h:127:7: note: previous definition of 'class DS3231' class DS3231 { ^~~~~~ In file included from Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:28:0: D:\Arduino\libraries\RTC\src/RTC.h:227:7: error: redefinition of 'class PCF8563' class PCF8563 ^~~~~~~ In file included from D:\Arduino\libraries\RTC\src/PCF8563.h:10:0, from Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:27: D:\Arduino\libraries\RTC\src/RTC.h:227:7: note: previous definition of 'class PCF8563' class PCF8563 ^~~~~~~ Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino: In function 'void printTime()': PCF85063TP_RTC:51:13: error: 'class DS1307' has no member named 'GetTime'; did you mean 'setTime'? RTclock.GetTime(); ^~~~~~~ setTime PCF85063TP_RTC:52:26: error: 'class DS1307' has no member named 'hour' Serial.print(RTclock.hour, DEC); ^~~~ PCF85063TP_RTC:54:26: error: 'class DS1307' has no member named 'minute'; did you mean 'setMinutes'? Serial.print(RTclock.minute, DEC)s ^~~~~~ setMinutes PCF85063TP_RTC:56:26: error: 'class DS1307' has no member named 'second' Serial.print(RTclock.second, DEC); ^~~~~~ PCF85063TP_RTC:58:26: error: 'class DS1307' has no member named 'month'; did you mean 'setMonth'? Serial.print(RTclock.month, DEC); ^~~~~ setMonth PCF85063TP_RTC:60:26: error: 'class DS1307' has no member named 'dayOfMonth'; did you mean 'setMonth'? Serial.print(RTclock.dayOfMonth, DEC); ^~~~~~~~~~ setMonth PCF85063TP_RTC:62:26: error: 'class DS1307' has no member named 'year' Serial.print(RTclock.year + 2000, DEC); ^~~~ PCF85063TP_RTC:64:26: error: 'class DS1307' has no member named 'dayOfMonth'; did you mean 'setMonth'? Serial.print(RTclock.dayOfMonth); ^~~~~~~~~~ setMonth PCF85063TP_RTC:66:21: error: 'class DS1307' has no member named 'dayOfWeek' switch (RTclock.dayOfWeek) { // Friendly printout the weekday ^~~~~~~~~ PCF85063TP_RTC:67:14: error: 'MON' was not declared in this scope case MON: ^~~ PCF85063TP_RTC:70:14: error: 'TUE' was not declared in this scope case TUE: ^~~ Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:70:14: note: suggested alternative: 'JUNE' case TUE: ^~~ JUNE PCF85063TP_RTC:73:14: error: 'WED' was not declared in this scope case WED: ^~~ PCF85063TP_RTC:76:14: error: 'THU' was not declared in this scope case THU: ^~~ PCF85063TP_RTC:79:14: error: 'FRI' was not declared in this scope case FRI: ^~~ PCF85063TP_RTC:82:14: error: 'SAT' was not declared in this scope case SAT: ^~~ PCF85063TP_RTC:85:14: error: 'SUN' was not declared in this scope case SUN: ^~~ Y:\2021_Images\Arduino\PCF85063TP_RTC\PCF85063TP_RTC.ino:85:14: note: suggested alternative: 'JUNE' case SUN: ^~~ JUNE exit status 1 'class DS1307' has no member named 'GetTime'; did you mean 'setTime'? This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences.