getMonth() Function in JavaScript Returns Previous Month

In JavaScript, the getMonth() method returns the month of the specified date, starting from 0 (January). However, when used with dates formatted as "Sun Jul 7 00:00:00 EDT 2013," it can provide the previous month instead of the expected one.

This is because the getMonth() method assumes that the month value starts from 0 instead of 1. Therefore, when you call d1.getMonth() on the provided date, it returns 6 (representing July), but you may expect it to return 7.

To resolve this issue, you can simply add 1 to the result of getMonth() to get the correct month number. For example:

var d1 = new Date("Sun Jul 7 00:00:00 EDT 2013");
d1.getMonth()   1; //returns 7

By adding 1, you effectively convert the month value from the 0-based indexing to the 1-based indexing, which is commonly used for calendar months. This will ensure that getMonth() returns the correct month for dates formatted in the specified format.