Need help to modify clock code

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1

I had build clock from plans I found online and want to add 12/24 hour time and alarm to it.I am new to arduino and programming in general.Can someone modify code for me.For $$ or exchange for clock.
Here is link to clock build plans The TC18 – My IV-18 Based VFD Tube Clock – vonnieda.org

Thanks

2

If you want to make the clock display the hour in the range 1 to 12, instead of 1 to 24, the fix is simple. Change:

  byte h = Wire.receive();

to

  byte h = Wire.receive();
  if(h > 12)
    h -= 12;

"Adding an alarm" is not as trivial. The Arduino that is powering the clock certainly knows the time, and could sound an alarm at a specific time. But, setting that time requires user input, as would enabling, disabling, and silencing the alarm. Not to mention the need to add a noise maker. How will that user input be supplied?

3

PaulS:
If you want to make the clock display the hour in the range 1 to 12, instead of 1 to 24 ...

Ummm, how about 0 to 23?

4

I'm adding piezo to PB1 and PB2 thats pin 13 and 14 on atmega and want to set everything with rotary decoder.

5

Ummm, how about 0 to 23?

Sure, that would work.