How to find the difference between two Dates and display it using Number of Years, months and Days using java script?

Question

I have tried all the solutions in the stack overflow, but couldn't find the exact solution or answer for my question.Some times it shows negative values when i tried to convert the date using getTime(), and sometimes the number of days showed in the answers seems to be incorrect compared to the manually calculated one. I've added the code that've used for my calculation. Please make a look.

Referred : Difference between two dates in years, months, days in JavaScript

var date2 = new Date("2018-01-01");
var date1 = new Date("2017-01-01");


var diff = Math.floor(date2.getTime() - date1.getTime());
//1000*60*60*24
var secs = Math.floor(diff / 1000);
var mins = Math.floor(secs / 60);
var hours = Math.floor(mins / 60);
var days = Math.floor(hours / 24);
var months = Math.floor(days / 31);
var years = Math.floor(months / 12);
months = Math.floor(months % 12);
days = Math.floor(days % 31);
hours = Math.floor(hours % 24);
mins = Math.floor(mins % 60);
secs = Math.floor(secs % 60);
var message = "";
if (days <= 0) {
  message += secs + " sec ";
  message += mins + " min ";
  message += hours + " hours ";
} else {
  message += days + " days ";
  if (months > 0 || years > 0) {
    message += months + " months ";
  }
  if (years > 0) {
    message += years + " years ago";
  }
}
console.log(message);

//Expected result is : 1 year 0 months 0 days.


//Actual result is : 11 months 24 days.

wouldn't the expected result be 1 year 0 months 0 days? ... `var months = Math.floor(days / 31);` .. but only 7 months have 31 days, so that's an odd calculation — Jaromanda X, May 08 '19 at 05:02
@Jaromanda X yeah it's corrected now! how to differentiate 31 days , 30days, 28days? — BatmanForLife, May 08 '19 at 05:07

score -1 · Answer 1 · answered May 08 '19 at 05:18

-1

There aren't 31 days in a month. In a non-leap year there are 30.417 days.

answered May 08 '19 at 05:18

Dinsdale Trelawney

37
6

Syed mohamed aladeen · Accepted Answer · 2019-05-08T10:19:29.043

Try like this, but unlike your expected result.12 months which is equal to 1 year.

the result of my code is 1 Year 0 Months 0 Days.

var date2 = new Date("2021-01-01")
var date1 = new Date("2020-01-01");

function getdiff(date2, date1) {

  var yeardate2 = date2.getYear();
  var monthdate2 = date2.getMonth();
  var datedate2 = date2.getDate();
  var yeardate1 = date1.getYear();
  var monthdate1 = date1.getMonth();
  var datedate1 = date1.getDate();
  var diff = {};
  var res = "";
  var yearString = "";
  var monthString = "";
  var dayString = "";


  yearTot = yeardate2 - yeardate1;

  if (monthdate2 >= monthdate1)
    var monthTot = monthdate2 - monthdate1;
  else {
    yearTot--;
    var monthTot = 12 + monthdate2 -monthdate1;
  }

  if (datedate2 >= datedate1)
    var dateTot = datedate2 - datedate1;
  else {
    monthTot--;
    var dateTot = 31 + datedate2 - datedate1;

    if (monthTot < 0) {
      monthTot = 11;
      yearTot--;
    }
  }

  diff = {
    years: yearTot,
    months: monthTot,
    days: dateTot
  };

  if ( diff.years > 1 ) yearString = " years ";
  else yearString = " year ";

  if ( diff.months> 1 ) monthString = " months ";
  else monthString = " month ";

  if ( diff.days > 1 ) dayString = " days ";
  else dayString = " day ";
   
  
  res = diff.years + yearString  + diff.months + monthString + diff.days + dayString;

  return res;
}


console.log(getdiff(date2, date1))

this is only 99% correct - try `2021-01-01` and `2020-01-01` for example — Jaromanda X, May 08 '19 at 05:33
This fails for many dates, e.g. "2018-03-01", "2018-01-31" returns 0 years 0 months 29 days when it's 1 month and 1 day. There are many other cases. Such simple solutions are appealing, but wrong too often to be useful. — RobG, May 08 '19 at 06:09
It still fails for various dates, it's a **flawed strategy**. E.g. "2019-09-01", "2019-07-01" returns 2 Months 3 Days, which is clearly wrong. — RobG, May 08 '19 at 09:35
@JaromandaX , RobG. check my answer now completely updated my answer — Syed mohamed aladeen, May 08 '19 at 10:20

How to find the difference between two Dates and display it using Number of Years, months and Days using java script?

2 Answers2