DC3231RTC with LCD and Ardiuno UNO for CLOCK!

Hello!

I want to use display time on LCD. Can you suggest codes that I can use? I have code for using RTC but I don't know how to combine them. When I tried to display seconds from the DC3231 it gives error.
Arduino: 1.6.12 (Windows 10), Board: "Arduino/Genuino Uno"

C:\Users\SALAMA~1\AppData\Local\Temp\untitled856238954.tmp\sketch_oct18a\sketch_oct18a.ino: In function 'void loop()':

sketch_oct18a:135: error: 'lcd' was not declared in this scope

lcd.clear();

^

exit status 1
'lcd' was not declared in this scope

Invalid library found in C:\Users\Salamat B\Documents\Arduino\libraries_RTCtime: C:\Users\Salamat B\Documents\Arduino\libraries_RTCtime
Invalid library found in C:\Users\Salamat B\Documents\Arduino\libraries_RTCtime: C:\Users\Salamat B\Documents\Arduino\libraries_RTCtime

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

This post would have more information with
some code posted between code tags.

So, where IS the code?

this should do the job

Here's one I made:
http://forum.arduino.cc/index.php?topic=408565.msg2823857#msg2823857
It uses a 16x2 character LCD.
If you have two push buttons, you can use them to set the time.