Intl.DateTimeFormat 中 dayPeriod 的參考 (Reference for dayPeriod in Intl.DateTimeFormat)

問題描述

Intl.DateTimeFormat 中 dayPeriod 的參考 (Reference for dayPeriod in Intl.DateTimeFormat)

什麼是 JavaScript Intl.DateTimeFormat 中的 dayPeriod，在 en‑US 語言環境中可以採用哪些值？另外，它在最近的瀏覽器中是否有廣泛的支持？

我似乎找不到任何參考。

參考解法

方法 1:

The only reference I could find was this Unicode Common Locale Data Repository (CLDR) table, and the associated downloads page. I am not sure how browsers implement it.

Fun fact, the number of day periods varies across locales. English has 4 (morning, afternoon, evening, night), while for example German has 6.

An excerpt from the xml file:

<dayPeriodRules locales="root">
    <dayPeriodRule type="am" from="00:00" before="12:00"/>  <!‑‑ AM ‑‑>
    <dayPeriodRule type="pm" from="12:00" before="24:00"/>  <!‑‑ PM ‑‑>
</dayPeriodRules>
<dayPeriodRules locales="en">
    <dayPeriodRule type="midnight" at="00:00"/> <!‑‑ midnight ‑‑>
    <dayPeriodRule type="noon" at="12:00"/> <!‑‑ noon ‑‑>
    <dayPeriodRule type="morning1" from="06:00" before="12:00"/>    <!‑‑ morning ‑‑>
    <dayPeriodRule type="afternoon1" from="12:00" before="18:00"/>  <!‑‑ afternoon ‑‑>
    <dayPeriodRule type="evening1" from="18:00" before="21:00"/>    <!‑‑ evening ‑‑>
    <dayPeriodRule type="night1" from="21:00" before="06:00"/>  <!‑‑ night ‑‑>
</dayPeriodRules>

(by Christophe、Christophe)

參考文件

1. Reference for dayPeriod in Intl.DateTimeFormat (CC BY‑SA 2.5/3.0/4.0)