https://www.reddit.com/r/dailyprogrammer/comments/6jr76h/20170627_challenge_321_easy_talking_clock/

HowIApproachedIt .js

//PS. twenty-five is more common then twenty five I belive, so I used dash.
const apm=(num)=>num<12?'AM':'PM';

const hh=(num)=>{
  const ones=['twelve','one','two','three','four','five','six','seven','eight','nine','ten','eleven'];
  return ones[num%12];
};

const mm=(num)=>{
  if(num==='00') return '';
  if(num<10) return `oh ${hh(num[1])}`;
  const teens=['ten','eleven','twelve','thirteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen'];
  if(num<20) return teens[num-10];
  const bigs={2:'twenty',3:'thirty',4:'fourty',5:'fifty'};
  return num[1]==='0' ? bigs[num[0]] : bigs[num[0]]+'-'+hh(num[1]);
};

const res=(str)=>{
  const s=str.split(':');
  if (mm(s[1])==='') return "It's "+hh(s[0])+" "+apm(s[0]); // gotcha did you get it?
  return `It's ${hh(s[0])} ${mm(s[1])} ${apm(s[0])}`;
};