Java8新特性之线程安全日期类

tue sep 10 09 : 34 : 04 cst 2019

private stringbuffer format(date date, stringbuffer toappendto,

                               fielddelegate delegate) {

         // convert input date to time field list

         calendar.settime(date);

         boolean usedateformatsymbols = usedateformatsymbols();

         for ( int i = 0 ; i < compiledpattern.length; ) {

             int tag = compiledpattern[i] >>> 8 ;

             int count = compiledpattern[i++] & 0xff ;

             if (count == 255 ) {

                 count = compiledpattern[i++] << 16 ;

                 count |= compiledpattern[i++];

             }

             switch (tag) {

             case tag_quote_ascii_char:

                 toappendto.append(( char )count);

                 break ;

             case tag_quote_chars:

                 toappendto.append(compiledpattern, i, count);

                 i += count;

                 break ;

             default :

                 subformat(tag, count, delegate, toappendto, usedateformatsymbols);

                 break ;

             }

         }

         return toappendto;

     }

//获取当前年月日

         localdate localdate = localdate.now();

         //构造指定的年月日

         localdate localdate1 = localdate.of( 2019 , 9 , 10 );

         //获取年、月、日、星期几

         int year = localdate.getyear();

         int year1 = localdate.get(chronofield.year);

         month month = localdate.getmonth();

         int month1 = localdate.get(chronofield.month_of_year);

         int day = localdate.getdayofmonth();

         int day1 = localdate.get(chronofield.day_of_month);

         dayofweek dayofweek = localdate.getdayofweek();

         int dayofweek1 = localdate.get(chronofield.day_of_week);

//创建localtime

         localtime localtime = localtime.of( 13 , 51 , 10 );

         localtime localtime1 = localtime.now();

         //获取小时

         int hour = localtime.gethour();

         int hour1 = localtime.get(chronofield.hour_of_day);

         //获取分

         int minute = localtime.getminute();

         int minute1 = localtime.get(chronofield.minute_of_hour);

         //获取秒

         int second = localtime.getsecond();

         int second1 = localtime.get(chronofield.second_of_minute);

//创建对象

         localdatetime localdatetime = localdatetime.now();

         localdatetime localdatetime1 = localdatetime.of( 2019 , month.september, 10 , 14 , 46 , 56 );

         //localdate+localtime-->localdatetime

         localdatetime localdatetime2 = localdatetime.of(localdate, localtime);

         localdatetime localdatetime3 = localdate.attime(localtime);

         localdatetime localdatetime4 = localtime.atdate(localdate);

         //获取localdate

         localdate localdate2 = localdatetime.tolocaldate();

         //获取localtime

         localtime localtime2 = localdatetime.tolocaltime();

// 默认时区

zoneddatetime zbj = zoneddatetime.now();

// 用指定时区获取当前时间

zoneddatetime zny = zoneddatetime.now(zoneid.of( "america/new_york" ));

localdatetime ldt = localdatetime.of( 2019 , 9 , 15 , 15 , 16 , 17 );

zoneddatetime zbj = ldt.atzone(zoneid.systemdefault());

zoneddatetime zny = ldt.atzone(zoneid.of( "america/new_york" ));

zoneddatetime zbj = zoneddatetime.now(zoneid.of( "asia/shanghai" ));

// 转换为纽约时间:

zoneddatetime zny = zbj.withzonesameinstant(zoneid.of( "america/new_york" ));

zoneddatetime zdt = ...

localdatetime ldt = zdt.tolocaldatetime();

//创建instant对象

         instant instant = instant.now();

         //获取秒数

         long currentsecond = instant.getepochsecond();

         //获取毫秒数

         long currentmilli = instant.toepochmilli();

         long l = system.currenttimemillis();

//修改localdate、localtime、localdatetime、instant

         localdatetime localdatetime = localdatetime.of( 2019 , month.september, 10 ,

                 14 , 46 , 56 );

         //增加一年

         localdatetime = localdatetime.plusyears( 1 );

         localdatetime = localdatetime.plus( 1 , chronounit.years);

         //减少一个月

         localdatetime = localdatetime.minusmonths( 1 );

         localdatetime = localdatetime.minus( 1 , chronounit.months);

         //通过with修改某些值

         //修改年为2020

         localdatetime = localdatetime.withyear( 2020 );

         //修改为2022

         localdatetime = localdatetime.with(chronofield.year, 2022 );

         //还可以修改月、日

localdate localdate = localdate.now();

localdate localdate1 = localdate.with(temporaladjusters.firstdayofyear());

localdate localdate = localdate.of( 2019 , 9 , 10 );

string s1 = localdate.format(datetimeformatter.basic_iso_date);

string s2 = localdate.format(datetimeformatter.iso_local_date);

//自定义格式化

datetimeformatter datetimeformatter = datetimeformatter.ofpattern( "dd/mm/yyyy" );

string s3 = localdate.format(datetimeformatter);

localdate localdate1 = localdate.parse( "20190910" , datetimeformatter.basic_iso_date);

localdate localdate2 = localdate.parse( "2019-09-10" , datetimeformatter.iso_local_date);

//构造器1：传入格式字符串

datetimeformatter formatter = datetimeformatter.ofpattern( "yyyy-mm-dd hh:mm:ss" );

//构造器2：传入格式字符串和地区

datetimeformatter formatter = datetimeformatter.ofpattern( "e, yyyy-mmmm-dd hh:mm:ss" , locale.us);

datetimeformatter formatter = datetimeformatter.ofpattern( "e, yyyy-mmmm-dd hh:mm:ss" , locale.china);