JavaScript: how to calculate the date that is 2 days ago?
JavascriptJavascript Problem Overview
> Possible Duplicate:
> Subtract days from a date in javascript
I have got a JavaScript that basically returns a date that is 2 days ago. It is as follows:
var x;
var m_names = new Array("January", "February", "March",
"April", "May", "June", "July", "August", "September",
"October", "November", "December");
var d = new Date();
var twoDaysAgo = d.getDate()-2; //change day here
var curr_month = d.getMonth();
var curr_year = d.getFullYear();
var x = twoDaysAgo + "-" + m_names[curr_month] + "-" + curr_year;
document.write(x);
Assuming today is 12-December-2012, the above will return the date 10-December-2012. I don't think this will work dynamically as we move forward into a new month, OR, change the day from -2 to -15. It will work only from the 3rd of the month.
How can I modify this so when it is 12-December-2012 today and I want it to return me the date 15 days ago it should be 27-November-2012... and not -3-December-2012?
Any help appreciated. Thanks! I'm a Javascript newbie.
Javascript Solutions
Solution 1 - Javascript
If you have a date object, you can set it to two days previous by subtracting two from the date:
var d = new Date();
d.setDate(d.getDate() - 2);
console.log(d.toString());
// First of month
var c = new Date(2017,1,1); // 1 Feb -> 30 Jan
c.setDate(c.getDate() - 2);
console.log(c.toString());
// First of year
var b = new Date(2018,0,1); // 1 Jan -> 30 Dec
b.setDate(b.getDate() - 2);
console.log(b.toString());
Solution 2 - Javascript
You can do the following
var date = new Date();
var yesterday = date - 1000 * 60 * 60 * 24 * 2; // current date's milliseconds - 1,000 ms * 60 s * 60 mins * 24 hrs * (# of days beyond one to go back)
yesterday = new Date(yesterday);
console.log(yesterday);
The Date is available as a number in miliiseconds, you take today subtract two days and create a new date using that number of milliseconds