There seems to be an error in the month within the

Can anyone explain why the month increases by 1 if its value is higher than 9? See the code snippet below:

var dd = new Date();
dd.setFullYear(2017);
dd.setMonth(7);
console.log("Month(Expected: 7, Received: " + dd.getMonth() + ")");
dd.setMonth(10);
console.log("Month(Expected: 10, Received: " + dd.getMonth() + ")");

You can check out the code on Fiddler here - https://jsfiddle.net/vzmtp3ua/

Answer №1

Not every month has 31 days, which is why any extra days are carried over to the following month.

For instance, if we set the date as October 31 and add a month, it would technically be November 31st. However, since November only has 30 days, the date automatically shifts to December 1st.

Answer №2

Occasionally, certain months do not have 31 days, resulting in additional days being tacked onto the subsequent month.

Answer №3

When a month has fewer days than the current date, it causes a shift to the first day of the following month. According to the documentation provided: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/setMonth

The behavior of the setMonth method is influenced by the current day of the month. Essentially, it adds the number of days equivalent to the current day in the month to the specified new month's 1st day as the parameter to generate the updated date. For instance, if the current date is August 31st, 2016, setting the month value to 1 would result in March 2nd, 2016 being returned. This discrepancy arises from February having 29 days in 2016.

Answer №4

Every month has a different number of days, so if one has 31 days it will roll over to the next.

Answer №5

If you initialize a Date object on October 31st and then change the month to November (which is represented as 10!), since November does not have 31 days, it will automatically switch to the 1st of the following month (December 1st).

Answer №6

The outcome is reliant on the current date. When you set the date to "now" (new Date()), and today happens to be October 31st.

If the day in your Date object is the 31st and you use setMonth(), any additional days will spill over into the next month for months that are shorter than 31 days. For example, if you attempt to do setMonth(1), it would result in February 31st, ultimately translating to March 3rd.

To circumvent this issue, you can provide a second argument to setMonth, which represents the specific day to be set. For instance, dd.setMonth(10,30) corresponds to November 30th.

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