将另一个元素的id传递给按钮的onclick事件？

I am trying to make it so that when I click on a button above a clock element that I have, it changes it from am to pm. I have many clock elements, each associated with their own am/pm buttons. Here is what I tried (piechart0 is the clock and clock.js is where I handle my js for it): I am trying to make it so that when I click on