Locale - Korean(ko) formats Month seems not right

[whtFlower]

I am not too familiar with i18n. However just looking at Korean/Japanese/Chinese, it seems like Korean format should be something like this(Notice the Month):
LL: 'YYYY년 MMMM D일', ==> 'YYYY년 M월 D일'

[iamkun]

@whtFlower Can you offer some more detail, please? (code console.log ...)

[whtFlower]

On our application we use dayjs and I am trying to implement i18n. While I was going through formats I have noticed that Korean version (ko) has the following format:
LL: 'YYYY년 MMMM D일',
I see year & date in korean but not month. Out of curiosity I looked up Chinese & Japanese and see
the following (ja.js)
LL: 'YYYY年M月D日'

It happen to be that I am very familiar with Japanese and also can read some Chinese characters. After looking up those two locales I am wondering if Korean need to be 'YYYY년 M월 D일' like those two other locales.

Also it seems like the space seems inconsistent to me. I might be wrong -as I said I am not too familiar with i18n and lots of these are just guessing.
However seems like some locales has space between year/month/date including korean but some don't like Japanese and Chinese.

-by the way, is there easy way to extract YYYY only with locale? Trying to add locale for input field with placeholder of 'YYYY'. I am using formats.LL and extract month/year/date with substring. Not sure if that is the best way to do get them.

[iamkun]

We just keep the same with https://github.com/moment/moment/blob/develop/locale/ko.js

you can use dayjs().format('YYYY')

[whtFlower]

I see.
One more question.
this is how I get months
dayjs.Ls.ko.months

I see months, weekdays, weekdaysShort, weekdaysMin.
However I don't see previousMonth & nextMonth in the object. How can get them?
Thanks for your help in advance!

[iamkun]

Seems we don't have a key named previousMonth , how did you find it?

[whtFlower]

@iamkun moment().format("YYYY") returns current year. What I need is
YYYY年 or YYYY년

[iamkun]

dayjs.format('YYYY년') is what you are looking for 😬

[whtFlower]

@iamkun I am trying to add correct i18n for the place of 'YYYY' (en) which should be 'YYYY년'. since you guys have locale set up already, I am wondering if there is easy way for me to get YYYY in different language.
I am manually extracting it from but wonder if there is way.
const _formatLL = dayjs.Ls.ko.formats.LL,
_year = _formatLL.slice(0, _formatLL.indexOf("M"))

[iamkun]

you can import 'dayjs/locale/ko' as an object and update it to the value you want.

Then set as a custom locale dayjs.locale(customObject, null, true)

check here https://github.com/iamkun/dayjs/blob/dev/docs/en/I18n.md#customize