Simple function to calculate days difference - just a reminder

daysBetween.js

const daysBetween = ( date1, date2 ) => {
  //Get 1 day in milliseconds
  let one_day=1000*60*60*24;

  // Convert both dates to milliseconds
  let date1_ms = date1.getTime();
  let date2_ms = date2.getTime();

  // Calculate the difference in milliseconds
  let difference_ms = date2_ms - date1_ms;
    
  // Convert back to days and return
  return Math.round(difference_ms/one_day); 
}

let a = new Date(2019,3,22)
let b = new Date(2019,5,18)

console.log(daysBetween(a,b))