CODEWITHSUNDEEP
javascriptdate
Daniel
Daniel

Reputation: 792

Two Javascript Date Variables

I don't seem to be able to get my head around the syntax required to have two date variables.

var videodate = new Date(2014,7,5);
var previousdate = videodate.getDate()-1;

This would allow me to have two links on the page:

<a href="today.mp4">{videodate}</a>
<a href="yesterday.mp4">{previousdate}</a>

What I am finding is that the solutions I've hunted around for use:

videodate.setDate(videodate.getDate()-1)

but that then changes the 'videodate' variable. I just want to be able to read 'videodate' in order to specify the 'previousdate'!? So something like:

var previousdate = new Date(videodate.getDate()-1)

Upvotes: 1

Views: 41

Answers (3)

sumit
sumit

Reputation: 15464

Convert into timestamp

var videodatets = new Date('July 07 2014').getTime();

var previousdatets = videodatets-24*60*60*1000;

var videodate=new Date(videodatets);
var previousdate=new Date(previousdatets);
alert(videodate);
alert(previousdate);

Upvotes: 0

Irvin Dominin
Irvin Dominin

Reputation: 30993

You can substract the time in millisecond of a day a build a new date object:

var videodate = new Date(2014,7,5);
var previousdate  = new Date(videodate.getTime() - (24 * 60 * 60 * 1000));

or alternatively use moment.js, it will make you life easier on date stuff:

var videodate = new Date(2014,7,5);
var previousdate = moment(videodate).subtract('days', 1);

In both ways the original videodate variable will not be touched.

Demo: http://jsfiddle.net/IrvinDominin/pcPCJ/

Upvotes: 1

MrCode
MrCode

Reputation: 64526

Create a separate new date object for the previous date, setting it to the same date as the first by using .getTime(), then do the -1 on it, keeping the two dates independent of one another. 

var videodate = new Date(2014,7,5);
var previousdate = new Date(videodate.getTime());
previousdate.setDate(previousdate.getDate()-1);

Upvotes: 3

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