use date.toLocaleDateString to format year/month

[SergioCrisostomo]

This changes how Date picker label is displayed.

With this change the text for month year comes from JavaScript Date.prototype.toLocaleString() combined with the locale file i.datepicker.datePanelLabel.

What we can configure is the format following this pattern:

yyyy - 4 digit year
m - month, numeric, 1 - 12
mm - month, numeric, 01 - 12
mmm - month, 3 letters, as in toLocaleDateString
Mmm - month, 3 letters, capitalize the return from toLocaleDateString
mmmm - month, full name, as in toLocaleDateString
Mmmm - month, full name, capitalize the return from toLocaleDateString

The [...] indicates the month or year field that will be used as target for the @click events.

Examples:

• zn-CN format: '[yyyy年] [m月]'
• zh-PT format: '[mmmm] de [yyyy]'
• vi-VN format: '[Tháng mm]/[yyyy]'

[SergioCrisostomo]

@dspangenberg, @MatiasVerdier, @LekisS, @IndraGunawan, @dokenzy, @explosivebit, @ndrshn, @hckhanh

Please give me some help: the DatePicker label needs some adjustment for i18n.

Could you please check and let me know what would be the correct/expected format in your language: https://jsfiddle.net/Sergio_fiddle/tf89oa79/9/ ?

[IndraGunawan]

id-ID format MMMM yyyy

[dspangenberg]

de-DE: MMMM yyyy is correct

[LekisS]

fr-FR: MMMM yyyy

[MatiasVerdier]

es-ES: MMMM yyyy is correct

[ndrshn]

tr-TR: MMMM yyyy is correct

[dokenzy]

ko-KR: yyyy년 mm월 2017. 10. 16. 오후 8:56, ndrshn <notifications@github.com> 작성:

…

tr-TR: MMMM yyyy is correct — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

[hckhanh]

vi-VN: Tháng mm/yyyy is correct 👍

[explosivebit]

ru-RU: MMMM yyyy is correct

[explosivebit]

I'm sorry, that's the correct MMM format yyyy

[SergioCrisostomo]

@explosivebit just to clearify what would the month now be:

a) октябрь 2017
b) Oктябрь 2017
c) Окт 2017
d) окт 2017

[explosivebit]

b) Oктябрь 2017

[icarusion]

@SergioCrisostomo i found that [m] is begin at 0, so, my country is displayed 9, it should be 10, could you have a check?

[dokenzy]

I'm sorry I made a mistake. In ko-KR, 'yyyy년 m월' is correct.

BTW,
m - month, numeric, 1 - 12
m - month, numeric, 01 - 12
what's diffent between first 'm' and second 'm'? Isn't second one 'mm'?

[SergioCrisostomo]

@icarusion sorry for that, fix suggested in #2170.
@dokenzy yes, should be mm, fix suggested in #2170, thanks!