java 9 AKST timezone parsing

[Naoto Sato]

(replying to appropriate aliases, instead of generic jdk9-dev alias)

Hi Clément,

The locale data, where those time zone names are derived from, have been 
switched to use Unicode Consortium's CLDR, instead of the ones that are 
previously used prior to JDK9. So there will be some differences you may 
encounter. However it seems not right to parse "AKST" to SystemV time 
zone. I'd appreciate it if you file a JIRA issue for this.

In the mean time, you can revert to the JDK8 behavior by setting the 
system property "-Djava.locale.providers=COMPAT" to the command line.

HTH,
Naoto

On 10/10/17 7:37 PM, Clément Guillaume wrote:
> Hello,
> 
> When parsing a date time string that contains a time zone like AKST, AKDT,
> HST or AST with a DateTimeFormatter built from a pattern containing 'z',
> java 9 returns the SystemV variant of those timezone, which then behave
> differently as the "modern" ones. Looks like it's also an issue with long
> time zone ("Alaska Standard Time")
> 
>  From my digging I noticed that the PrefixTree generated
> by ZoneTextPrinterParser.getTree is different in java 8 and java 9, and
> this may be caused by a different order in the content returned
> by TimeZoneNameUtility.getZoneStrings(Locale.getDefault())
> 
> Is this an expected behavior of java 9? (other american time zones are
> parsed to the modern version: PST -> America/Los_Angeles)
> 
> I tested it with java 9 build 9+181 and java 8 build 1.8.0_131-b11 (both
> linux 64 with en_US as local) on this code:
> 
> import java.time.ZoneOffset;
> import java.time.format.DateTimeFormatter;
> import java.time.temporal.TemporalAccessor;
> 
> public class Main{
> 
> public static void main(String[] args){
> DateTimeFormatter timezoneFormatter = DateTimeFormatter.ofPattern("z");
> TemporalAccessor temporalAccessor = timezoneFormatter.parse("AKST");
> System.out.println(temporalAccessor);
> temporalAccessor = timezoneFormatter.parse("AKDT");
> System.out.println(temporalAccessor);
> temporalAccessor = timezoneFormatter.parse("HST");
> System.out.println(temporalAccessor);
> temporalAccessor = timezoneFormatter.parse("AST");
> System.out.println(temporalAccessor);
> 
> DateTimeFormatter isoFormatter =
> DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mmX").withZone(ZoneOffset.UTC);
> temporalAccessor =
> DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSz").parse("2017-09-13T06:30:33.123AKST");
> System.out.println(temporalAccessor);
> System.out.println(isoFormatter.format(temporalAccessor));
> temporalAccessor =
> DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSVV").parse("2017-09-13T06:30:33.123America/Anchorage");
> System.out.println(temporalAccessor);
> System.out.println(isoFormatter.format(temporalAccessor));
> }
> 
> }
>