Why are python and javascript showing different timestamp for the same date

Question

Below is the javscript code that I am using to get the timestamp of a particular date I got it from here

var myDate = "12-11-2021";
myDate = myDate.split("-");
var newDate = new Date(myDate[2], myDate[1] - 1, myDate[0]);
console.log(newDate.getTime());

The output is 1636655400000

and below is the python code I am using to get the timestamp I got it from the first comment and the accepted answer

datetime.strptime('2021-11-12', '%Y-%m-%d').timestamp()*1000

The outout 1636675200000.0

Why are the two timestamps different ?

Javascript has an unintuitive way to give the month as argument. January is 0. — Klaus D., Nov 12 '21 at 12:45

score 1 · Answer 1 · answered Nov 12 '21 at 13:16

You are calling the Date constructor with these parameters:

var newDate = new Date('2021', '11', '12');

Which is basically representing the date 2021-12-12 and NOT 2021-11-12 as you would expect.

The reason is that in JS the month is zero-based, meaning 0 is January up to 11 for December.

1 Answers1