How to Subtract X Days from a JavaScript Date?

Subtracting Days from a Plain JavaScript Date

In JavaScript, you can easily go back a specified number of days from a given date using the setDate() method.

Question: How can I subtract X days from a plain JavaScript Date?

Answer:

To calculate the date X days before a given date:

1. Create a new Date object for the original date.
2. Use the setDate() method to modify the new date by subtracting X from its current day value.

For example, to calculate the date 5 days before today:

var d = new Date();
d.setDate(d.getDate() - 5);

Note:

• The setDate() method modifies the date object in place and returns the time value of the updated date.
• To display the updated date in a readable format, you can use the toLocaleString() method.

Example:

var d = new Date();

document.write('Today is: ' + d.toLocaleString());

d.setDate(d.getDate() - 5);

document.write('<br>5 days ago was: ' + d.toLocaleString());

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