How to subtract two angularjs date variables

angularjs, jquery

Solution

I'm also an angularjs novice but wouldn't you handle this by making properties available through your javascript view model?

For example have a style field that changes based on the date fields (ie style returns style 1 when if the difference is 10 days) and hopefully through the angularjs binding the updates will propagate to the screen.

I think the right term for this is a computed property or calculated property

EDIT

Not sure if this is what you're looking for but see fiddle for example of calculating date diff and changing a style all based off properties of the view model (scope)

`scope.diff` and `scope.col` are the 2 properties to bind to

http://jsfiddle.net/chrismoutray/wfjv6/

HTML

<script src="http://code.angularjs.org/0.10.4/angular-0.10.4.min.js" ng:autobind></script>
<div ng:controller="ComputedPropertiesCtrl">
    first date <input ng:model="firstdate"> second date <input ng:model="seconddate"> difference {{diff}}
    <div>when the difference is greater than 10 color changes to green</div>
    <div>eg set the second date to 15/01/2013</div>
    <div style="background-color:{{col}};"> State </div>
</div>

JS

function ComputedPropertiesCtrl() {
    var scope = this;
    scope.firstdate = '01/01/2013';
    scope.seconddate = '10/01/2013';
    scope.data_before = [];
    scope.differenceInDays = function() {

        var dt1 = scope.firstdate.split('/'),
            dt2 = scope.seconddate.split('/'),
            one = new Date(dt1[2], dt1[1]-1, dt1[0]),
            two = new Date(dt2[2], dt2[1]-1, dt2[0]);

        var millisecondsPerDay = 1000 * 60 * 60 * 24;
        var millisBetween = two.getTime() - one.getTime();
        var days = millisBetween / millisecondsPerDay;

        return Math.floor(days);      
    };
    scope.color = function() {
        return (scope.differenceInDays() > 10) ? 'green' : 'red';
    };

    scope.$watch('[firstdate, seconddate]', function(currScope,newVal,oldVal) {
        scope.data_before = oldVal;
        scope.diff = scope.differenceInDays();
    });

    scope.$watch('[firstdate, seconddate]', function(currScope,newVal,oldVal) {
        scope.data_before = oldVal;
        scope.col = scope.color();
    });
}

CSS

h2 { position: fixed; right: 10px; top: 10px; color: red; background:white;z-index:1000; }
input { width: 100px; }
div { margin: 10px; padding: 10px; }

Problem

I am fairly new to angularjs, but here it goes. I am able two dates through angularjs in the form `dd/mm/yyyy`, but what I need to do is somehow subtract the two dates to get the difference in days between the two. I created a jquery function to do this, but I don't know how to pass in the two dates to the function. So I was wondering if there was a different way to go about this? I am trying to set up a trigger system depending on the number of days in between the two dates for certain things to be stylized. For example if it's within 10 days I want it to use style 1 and if its within 20 days use style 2 and so on.

Original source