How to rotate servo every 12 hours using RTC module?
You have to spend some time and practice coding, it does not come over night. As far as your timing look up for an alarm clock sketch that will do what you want.  Once you understand that you should only have to add a few lines of code. As far as open source the tools you are using are open source. Remember there are people out there that are expertes and there people just starting so expect what you find to fall some in that range of quality.