<i18n dev> RFR: 8247781: Day periods support [v5]

[Naoto Sato]

On Wed, 4 Nov 2020 18:44:33 GMT, Joe Wang <joehw at openjdk.org> wrote:

>> Changes requested by scolebourne (Author).
>
> Since 24:00 is not represented in for example LocalTime and H (hour-of-day) 0-23, it seems obvious midnight in the JDK would be 00:00, and the new DayPeriod tests proves that. The CLDR rule for midnight is also obvious, but the LDML spec does state that it "strongly recommend" that implementations provide for the ability to specify whether midnight is supported or not (and for either 00:00 or 24:00 or both). 
> 
> Just wonder whether there is a need to explicitly state the fact about midnight? DateTimeFormatterBuilder::appendInstant() for example, stated clearly how 24:00 is processed, e.g. "The end-of-day time of '24:00' is handled as midnight at the start of the following day."

Thanks, Joe. I will incorporate some description about "midnight" in the next update.

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PR: https://git.openjdk.java.net/jdk/pull/938