JSFiddle - React, Tailwind, and code Playground

JavaScript

const datetimes = [{"2021-07-30":"8:00 AM - 10:00 AM"},{"2021-07-30":"12:00 PM - 2:00 PM"}];

const targetDate = "2021-07-30";
const targetTime = "12:00 PM - 2:00 PM";

datetimes.forEach(datetime => {
    for (const date in datetime) {
        if (date === targetDate && datetime[date] === targetTime) {
        console.log('exists!')
        console.log(datetime[date])
    }
  }
})