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How do I get the number of days between two dates in JavaScript

let today = new Date().toISOString().slice(0, 10)

const startDate  = '2021-04-15';
const endDate    = today;

const diffInMs   = new Date(endDate) - new Date(startDate)
const diffInDays = diffInMs / (1000 * 60 * 60 * 24);


alert( diffInDays  );
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javascript calculate days between dates

function calculateDaysBetweenDates(date1, date2) {
  var oneDay = 24 * 60 * 60 * 1000;
  var date1InMillis = date1.getTime();
  var date2InMillis = date2.getTime();
  var days = Math.round(Math.abs(date2InMillis - date1InMillis) / oneDay);
  return days;
}
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javascript Find the number of days between two days

const dayDif = (date1, date2) => Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000)

dayDif(new Date("2020-10-21"), new Date("2021-10-22"))
// Result: 366
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javascript difference between two dates in days

const diffDays = (date, otherDate) => Math.ceil(Math.abs(date - otherDate) / (1000 * 60 * 60 * 24));

// Example
diffDays(new Date('2014-12-19'), new Date('2020-01-01'));   // 1839
Comment

calculate days between two dates in javascript

<input id="first" value="25/2/2021"/>
<input id="second" value="26/2/2021"/>
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