Academic Year generator in JS (Start from October)

aay.js

const academicYear = (firstMonth = 8) => {
    const date = new Date(),
          year = date.getFullYear(),
          start = date.getMonth() > firstMonth
    return `${year - !start}/${year + start}`
}

/* const academicYear=(firstMonth=8)=>{const d=new Date(),y=d.getFullYear(),s=d.getMonth()>firstMonth;return `${y-!s}/${y+s}`} */

console.log(`Academic Year: ${academicYear()}`);