User input - difference of two dates in Javascript

Question

I am a beginner in JS. I have user input values of the date. I want to get the difference in days. Tried several methods, none of those worked. Used the input type as numbers but it doesn't work for an example like 03092017 - 29082017, it outputs the number difference not the date.

function resetForm() {
  location.reload();
}

function dates() {
  var n_Date = document.getElementById('ddate').value;
  var e_Date = document.getElementById('cdate').value;
  var nDate = new Date(n_Date);
  var eDate = new Date(e_Date);
  var nMonth = n_Date.getMonth();
  var eMonth = eDate.getMonth();
  var nYear = nDate.getFullYear();
  var eYear = eDate.getFullYear();
  var Years = Math.abs(nYear - eYear);
  var Months = Math.abs(nMonth - eMonth);
  var Dates = Math.abs(nDate - eDate);
  var fDate = Dates + Months + Years;

  if (fDate <= 7) {
    alert("You have: " + fDate + " days to return the book");
  } else if (eDate > 7) {
    var g = (fDate * 50);
    alert("Overdue by: " + fDate + " days fee is: " + g);
  }

}

<form id="myform">
  <table>
    <tr>
      <td>Book Returning Due Date:</td>
      <td><input type="date" id="ddate" placeholder="dd/mm/yyyy"></td>
    </tr>
    <tr>
      <td>Current Date:</td>
      <td><input type="date" id="cdate" placeholder="dd/mm/yyyy"></td>
    </tr>
    <tr>
      <td><input type="button" onclick="dates();" value="Check for Due"> </td>
      <td><input type="button" id="reset" onclick="resetForm()" value="Reset"></td>
    </tr>

  </table>
</form>

Please have a look in moment.js, which has the ability to handle durations... — Myonara
– Myonara, Commented Aug 29, 2017 at 7:51
Thank you.I am spending more time for moments.js now ,for referring. @Myonara — Tithira
– Tithira, Commented Aug 29, 2017 at 10:52
@TranAudi I went through , but it didn't help . Used the moments .Thanks — Tithira
– Tithira, Commented Aug 29, 2017 at 10:53

chirag satapara · Accepted Answer · 2017-08-29 07:58:03Z

1

Try to use moment.js for this.

var startDate = moment("13.04.2016", "DD.MM.YYYY");
var endDate = moment("28.05.2016", "DD.MM.YYYY");
var result = 'Diff: ' + endDate.diff(startDate, 'days');
  
  console.log(result);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://momentjs.com/downloads/moment.js"></script>

answered Aug 29, 2017 at 7:58

chirag satapara

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1 Comment

Tithira Over a year ago

Thanks it worked. New to moments.Quite fascinating.Cheers!

Nemani · Accepted Answer · 2017-08-29 07:52:08Z

1

check below sample solution to get diff between two dates in days

var nDate  = new Date(n_Date);
var eDate  = new Date(e_Date);
var diffInDays = nDate.getDate()-eDate.getDate()

here is solution with sample data:

 var nDate  = new Date("2017-08-29");
    var eDate  = new Date("2017-08-25");
    var diffInDays = nDate.getDate()-eDate.getDate()
console.log(diffInDays);

answered Aug 29, 2017 at 7:52

Nemani

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1 Comment

chirag satapara Over a year ago

what about if user change the month ?

MrGoodKat · Accepted Answer · 2017-08-29 08:02:56Z

0

you can do something like this:

var startDate = new Date(2017,08,29);
var endDate = new Date(2017,09,15);
var oneDayMilliseconds = 3600*24*1000;

var daysLeft = Math.round(Math.abs((startDate.getTime() - endDate.getTime())/(oneDayMilliseconds)));

console.log("Days left: " + daysLeft);

Hope it helps :)

edited Aug 29, 2017 at 8:02

answered Aug 29, 2017 at 7:56

MrGoodKat

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2 Comments

Tithira Over a year ago

Thank you so much for the great help.I was able to do it in this way too. (parseInt((pickdt- dropdt) / (24 * 3600 * 1000))) and got the value to do the math as in link

MrGoodKat Over a year ago

you are welcome @Tithira. yep, it's a good solution if you don't want dependencies.

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