JavaScript Reference
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Quick Reference

The Date setMonth() method sets the month (0 to 11) of a Date object: January = 0, February = 1, March = 2 … December = 11.

It can also set the day of the month.

<!-- html element to place output -->
<p id="my_output"></p>
// variable
let my_date = new Date();

// set date
my_date.setMonth(11);

// output to the HTML element
document.getElementById('my_output').innerHTML = my_date.getMonth();

Output

8

Syntax

Date.setMonth(month, day)

Parameters

ValueDescription
monthThe month (0 to 11) (required)
Other values:
  • -1 will result in the last month of the previous year
  • 12 will result in the first month of the next year
dayThe day (0 to 31)
Other values:
  • 0 gives the last day of the previous month
  • -1 gives the day before the last day of the previous month
  • 32 gives the first day of the next month (if 31 days)

JavaScript Notes:

  • When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • JavaScript is a case-sensitive language; firstName is NOT the same as firstname
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
  • JavaScript variables must begin with a letter, $, or _
  • JavaScript variables are case sensitive (x is not the same as X)
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