JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.2/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.0/dayjs.min.js"></script>

JavaScript

//All of this is too replicate your api response

/* const dates = ['Apr 14th, 2022', 'Apr 14th, 2022', 'Apr 12th, 2022', 'Apr 12th, 2022', 'Apr 11th, 2022'] */
const months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
const months31 = [0, 2, 4, 6, 7, 9, 11]
const months30 = [3, 5, 8, 10]

//the GET for the API
let dates = [];
for(i = 0; i<5000; i++) {
	const random = Math.floor(Math.random() * 12)
	const month = months[random];
  //I know all days don't have
  let random2;
  if(months31.includes(random)) 
  	random2 = 31
  else if(months30.includes(random))
    random2 = 30
  else
  	random2 = 28
  
  const day = Math.floor(Math.random() * random2 + 1);
 	let abbreviation = 'th'
  if(day % 10 === 1)
  	abbreviation = 'st'
  else if(day % 10 === 2)
  	abbreviation = 'nd'
  else if(day % 10 === 3)
  	abbreviation = 'rd'
  const year = Math.floor(Math.random() * 5 + 2018)

	const timeInString = `${month} ${day}${abbreviation}, ${year}`;
  if(moment(moment(timeInString, 'MMM Do YYYY')).isSameOrAfter(moment())) {
  	i--
    continue
  }
  dates.push(timeInString)
}


//This is where we get to the code relevant to displaying a bar chart


const fourteenDaysAgo = moment().subtract(14, 'days')

let barChartArray = new Array(14).fill(0);

console.log(barChartArray)

dates.forEach((date) => {
	const dateAsMoment = moment(date, 'MMM Do, YYYY')
 	const DateIsInFourteenDayRange = moment(dateAsMoment).isAfter(fourteenDaysAgo, 'day')
  if(DateIsInFourteenDayRange) {
  	//initalizes a new moment that start at the beginning of the day
    //checks the differences in days between now and that date
    //uses that difference to populat the barChartArray
  	const index = moment().startOf('day').diff(dateAsMoment, 'days')
    barChartArray[index]++
  }
})

console.log(barChartArray)