Strange behaviour of Date.getMonth() - Month difference

Question

In a project I need to convert in javascript a timestamp into a human readable string, however the number of month was incorrect so I performed the following test in a javascript console :

How to explain why there is a one month difference ?

Thank you in advance

Months are from 0 to 11. Check the [documentation](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date) — abhishekkannojia, Aug 24 '17 at 08:22
getMonth() function is zero indexed based. You need to do date.getMonth() + 1 — Pol Fernández, Mar 15 '18 at 09:45

score 5 · Accepted Answer · answered Aug 24 '17 at 08:22

5

Javascript dates start at 0 for months

example:

0: Jan
1: Feb
2: Mar
etc

answered Aug 24 '17 at 08:22

Mike

852
9
17

score 3 · Answer 2 · answered Aug 24 '17 at 08:22

3

In javascript months start from 0. So January is 0, and december is 11

answered Aug 24 '17 at 08:22

N. Ivanov

1,795
2
15
28

score 3 · Answer 3 · answered Aug 24 '17 at 08:22

3

docs

Return value An integer number, between 0 and 11, representing the month in the given date according to local time. 0 corresponds to January, 1 to February, and so on.

answered Aug 24 '17 at 08:22

Ivan Minakov

1,432
7
12

score 3 · Answer 4 · answered Aug 24 '17 at 08:22

3

Javascript's date.getMonth starts the month count from 0. So you need to add +1.

var date = new Date();
console.log(date.getMonth() + 1);

answered Aug 24 '17 at 08:22

Koby Douek

16,156
19
74
103

Strange behaviour of Date.getMonth() - Month difference

4 Answers4