CODEWITHSUNDEEP
javascript
labman
labman

Reputation: 59

calculate days between dates

I'm trying to calculate the days between 2 dates but just keep getting "NaN. I've looked at other posts but can't quite work it out :-S

function checkdate() {

var currentTime = new Date()
var month = currentTime.getMonth() + 1
var day = currentTime.getDate()
var year = currentTime.getFullYear()
var datenow = (day + "/" + month + "/" + year)  


var startdate = document.forms[0].datescopestart.value;
var sDate = new Date(Date.parse("startdate","dd/mm/yy"));

var totaldays = Date.datenow - Date.sDate;  
    alert(totaldays);
    }

Upvotes: 0

Views: 1135

Answers (3)

Mark Pieszak - Trilon.io
Mark Pieszak - Trilon.io

Reputation: 66921

Here's the function I've had in my library for a while now, works great.

function days_between(date1, date2) {

  // The number of milliseconds in one day
  var ONE_DAY = 1000 * 60 * 60 * 24

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

  // Calculate the difference in milliseconds
  var difference_ms = Math.abs(date1_ms - date2_ms)

  // Convert back to days and return
  return Math.round(difference_ms/ONE_DAY)

}

Upvotes: 3

Niet the Dark Absol
Niet the Dark Absol

Reputation: 324610

The easiest way to do this is as follows:

var days = Math.floor(enddate.getTime()-startdate.getTime())/(24*60*60*1000);

Where startdate and enddate are valid Date objects.

Upvotes: 0

Lars Kotthoff
Lars Kotthoff

Reputation: 109232

Remove the quotes around startdate in the call to Date.parse. And the Date. in front of your variable names in the calculation.

Upvotes: 1

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