How to calculate a date x days before a given date using javascript

Question

How to calculate a date x days before a given date using javascript

In my Angular application, I am dealing with a date value that is stored in local storage.

My current code snippet retrieves the date like this:

$scope.selectedDate = localStorage.getItem('selDate');

The returned date from this code is '11-4-2015'.

However, what I actually need is to get this date minus 85 days.

I attempted the following:

var hearingOffset = 85;
var selectedDate = new Date(localStorage.getItem('selDate').replace(/-/g, '/') - hearingOffset);

Unfortunately, this resulted in an "Invalid Date" error.

How can I adjust the code to obtain the correct date?

javascript angularjs date

Answer 1

Answer №1

Timekeeper is a great tool for this task.

Timekeeper(date).decrement(85, 'days').getDate()

Answer 2

Timekeeper is a great tool for this task.

Timekeeper(date).decrement(85, 'days').getDate()

Answer 3

Answer №2

Just sharing a helpful tip with you

var d = new Date(); // current date
var x = 85; // going back 85 days
d.setDate(d.getDate() - x);

After obtaining the date, you can easily convert it to your desired format

UPDATE

When subtracting dates, the result is in milliseconds so we need to convert it back to a date object.

var d = new Date('11-4-2015');
var x = 85; // going back 85 days
var y=d.setDate(d.getDate() - x);
var date = new Date(y);
document.getElementById('dateHolder').innerHTML=date;

Check out the updated Fiddle here

Answer 4

Just sharing a helpful tip with you

var d = new Date(); // current date
var x = 85; // going back 85 days
d.setDate(d.getDate() - x);

After obtaining the date, you can easily convert it to your desired format

UPDATE

When subtracting dates, the result is in milliseconds so we need to convert it back to a date object.

var d = new Date('11-4-2015');
var x = 85; // going back 85 days
var y=d.setDate(d.getDate() - x);
var date = new Date(y);
document.getElementById('dateHolder').innerHTML=date;

Check out the updated Fiddle here

How to calculate a date x days before a given date using javascript

Answer №1

Answer №2

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