Get month number from date string Javascript

Question

I have tried searching SO but couldn't find any answers replicating what I am trying to achieve...

If I console log the following:

console.log(new Date().getMonth())

It outputs 10.

What I want to do, is take the following date string:

"2020-11-30T08:37:20.717Z"

And convert it so that it's just '10' to indicate the month, like the Date object above, and not the full date string. In that string, the number is '11', so I can't just pull that out unless I minus 1 from it perhaps?

Obviously in December, the output of the console log above would be 11... But I'd want that date string to remain as 10 to indicate November.

But how do I do this? I've seen other examples where they convert it into a month name, but I just wish for it to be the same as the Date object.

Any pointers would be great - hope that's clear.

Does this answer your question? [Convert string to datetime](https://stackoverflow.com/questions/5510580/convert-string-to-datetime) — Russ J, Nov 30 '20 at 16:07
Do you always want 10 regardless of month in the date string? — Zain Ul Abideen, Nov 30 '20 at 16:11
Russ J - no it doesn't. And Zain, no.. I want it to be dynamic with the months, this is just a badly explained example. :-) — Jon Nicholson, Nov 30 '20 at 16:12

mplungjan · Answer 1 · 2020-11-30T16:44:25.540

Yes, you need to subtract

It is safer than creating a date object since the timezone might move the month to the month before or after

const dString = "2020-10-31T23:00:00.000Z"
const mmFromString = dString.match(/-(\d{2})-/)[1]
console.log(mmFromString-1); // 9 (JS October) in any timezone

const d = new Date(dString)
const mmFromDate = d.getMonth();
console.log(mmFromDate) // 10 (JS November) in my timezone

score 0 · Answer 2 · answered Nov 30 '20 at 16:08

0

You can construct a Date object from the string and call getMonth().

console.log(new Date("2020-11-30T08:37:20.717Z").getMonth());

answered Nov 30 '20 at 16:08

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This will fail in my timezone at the end of the month around 11pm – mplungjan Nov 30 '20 at 16:19

Get month number from date string Javascript

2 Answers2