java - Formatting MonthDay using DateTimeFormatter.ofLocalizedDate -


this question has answer here:

i trying format monthday object in way not have specify order. trying use localized datetimeformatter.

i have code:

localdate datetime = localdate.parse("2017-08-11", datetimeformatter.ofpattern("yyyy-mm-dd")); monthday monthday = monthday.from(datetime); system.out.println(monthday.format(datetimeformatter.ofpattern("mmmm dd").withlocale(locale.english))); system.out.println(monthday.format(datetimeformatter.ofpattern("mmmm dd").withlocale(locale.germany))); system.out.println(monthday.format(datetimeformatter.ofpattern("mmmm dd").withlocale(locale.forlanguagetag("uk"))));  system.out.println(datetime.format(datetimeformatter.oflocalizeddate(formatstyle.medium).withlocale(locale.english))); system.out.println(datetime.format(datetimeformatter.oflocalizeddate(formatstyle.medium).withlocale(locale.forlanguagetag("uk")))); // next line throws exception java.time.temporal.unsupportedtemporaltypeexception: unsupported field: yearofera system.out.println(monthday.format(datetimeformatter.oflocalizeddate(formatstyle.medium).withlocale(locale.forlanguagetag("uk"))));

the first 3 prints print expected translated month , day, month , day. not change order because explicitly telling order.

the next 2 (before exception) print respectively:

aug 11, 2017 11 серп. 2017

notice how day either before or after month depending on locale passed function. how do monthday object last line throws exception when done in way.

the other answers given far describe limitations of standard datetimeformatter, see unsolved related jdk-issue. suggested workaround edit localized date pattern removing "y" etc. tricky , might not work locales due existence of other localized literals inside pattern.

however, might consider using external libraries have stronger focus on internationalization issues , have capability format month-day-object using locale information. locale determines order of field components , dots, spaces or other special literals (like in chinese).

here 2 options necessary type conversions related system timezone:

icu4j

monthday md = monthday.now();  gregoriancalendar gcal =     new gregoriancalendar(         2000, // avoids possible leap year problems         md.getmonthvalue() - 1,         md.getdayofmonth()     );  dateformat df =     dateformat.getinstanceforskeleton(         dateformat.abbr_month_day,         locale.forlanguagetag("en")     ); system.out.println(df.format(gcal.gettime())); // aug 15  dateformat df2 =     dateformat.getinstanceforskeleton(         dateformat.abbr_month_day,         locale.forlanguagetag("de")     ); system.out.println(df2.format(gcal.gettime())); // 15. aug.  dateformat df3 =     dateformat.getinstanceforskeleton(dateformat.month_day, locale.forlanguagetag("zh")); system.out.println(df3.format(gcal.gettime())); // 8月15日

time4j

monthday md = monthday.now();  chronoformatter<annualdate> cf1 =     chronoformatter.ofstyle(displaymode.short, locale.german, annualdate.chronology()); system.out.println(cf1.format(annualdate.from(md))); // 15.8.  chronoformatter<annualdate> cf2 =     chronoformatter.ofstyle(displaymode.medium, locale.german, annualdate.chronology()); system.out.println(cf2.format(annualdate.from(md))); // 15.08.  chronoformatter<annualdate> cf3 =     chronoformatter.ofstyle(displaymode.long, locale.english, annualdate.chronology()); system.out.println(cf3.format(annualdate.from(md))); // aug 15  chronoformatter<annualdate> cf4 =     chronoformatter.ofstyle(displaymode.full, locale.german, annualdate.chronology()); system.out.println(cf4.format(annualdate.from(md))); // 15. august  chronoformatter<annualdate> cf5 =     chronoformatter.ofstyle(displaymode.full, locale.chinese, annualdate.chronology()); system.out.println(cf5.format(annualdate.from(md))); // 8月15日

disclaimer: time4j has been written myself fill gaps or improve other features of jsr-310 (java.time-package).


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