<i18n dev> Additional Date-Time Formats

[Joe Wang]

Hi Naoto,

The javadoc points to LDML, it seems to me though it might be useful to 
add more information similar to that for the ofPattern methods, what's 
under the "Patterns for Formatting and Parsing" section, so that for at 
least the common use cases we could rely on the javadoc without having 
to consult the LDML specification. Some comparison with the ofPattern 
methods might also be helpful.

Just my 2 cents.

Thanks,
Joe

On 1/20/22 1:46 PM, Naoto Sato wrote:
> Hello,
>
> I am proposing a couple of new factory methods in 
> java.time.format.DateTimeFormatter that produce flexible localized 
> date/time formats, other than the existing pre-defined 
> (FULL/LONG/MEDIUM/SHORT) styles. For example, if the user wants a year 
> and month only string, such as the title for the calendar, currently 
> they would have to use DateTimeFormatter.ofPattern() with explicit 
> pattern argument, such as "MMM y". This is problematic because it is 
> correct in locales such as US, but not correct in other locales.
>
> So, I propose methods that are parallel to ofPattern(), which take 
> pattern template. This is based on the CLDR's skeleton: 
> https://www.unicode.org/reports/tr35/tr35-dates.html#availableFormats_appendItems
>
> Detailed design can be found in the draft CSR: 
> https://bugs.openjdk.java.net/browse/JDK-8243445
>
> Comments are welcome.
>
> Naoto
>