日光节约时间和Java

Question

可能重复：
Get Daylight Saving Transition Dates For Time Zones in Java

有没有办法找到夏令时间切换日期和时间在Java中指定的时区？

Answer 1

尝试利用：java.util.TimeZone中（reference）

Answer 2

下面是一个类似的线程给出了一个回答你的问题：

Get Daylight Saving Transition Dates For Time Zones in Java

Answer 3

此信息驻留在TimeZone，是不幸无法访问。你可以使用toString()一些，但不是在一个非常实用的方法：

for(final String timeZoneId : TimeZone.getAvailableIDs()){ 
    System.out.println(TimeZone.getTimeZone(timeZoneId)); 
} 

输出：

sun.util.calendar.ZoneInfo[id="Etc/GMT+2",offset=-7200000,dstSavings=0,useDaylight=false,transitions=0,lastRule=null] 
sun.util.calendar.ZoneInfo[id="America/Scoresbysund",offset=-3600000,dstSavings=3600000,useDaylight=true,transitions=118,lastRule=java.util.SimpleTimeZone[id=America/Scoresbysund,offset=-3600000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=3600000,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTime=3600000,endTimeMode=2]] 
sun.util.calendar.ZoneInfo[id="Atlantic/Azores",offset=-3600000,dstSavings=3600000,useDaylight=true,transitions=221,lastRule=java.util.SimpleTimeZone[id=Atlantic/Azores,offset=-3600000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=3600000,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTime=3600000,endTimeMode=2]] 
sun.util.calendar.ZoneInfo[id="Atlantic/Cape_Verde",offset=-3600000,dstSavings=0,useDaylight=false,transitions=6,lastRule=null] 
sun.util.calendar.ZoneInfo[id="Etc/GMT+1",offset=-3600000,dstSavings=0,useDaylight=false,transitions=0,lastRule=null] 
sun.util.calendar.ZoneInfo[id="Africa/Abidjan",offset=0,dstSavings=0,useDaylight=false,transitions=3,lastRule=null] 
sun.util.calendar.ZoneInfo[id="Africa/Accra",offset=0,dstSavings=0,useDaylight=false,transitions=17,lastRule=null] 
sun.util.calendar.ZoneInfo[id="Africa/Bamako",offset=0,dstSavings=0,useDaylight=false,transitions=5,lastRule=null] 
sun.util.calendar.ZoneInfo[id="Africa/Banjul",offset=0,dstSavings=0,useDaylight=false,transitions=4,lastRule=null] 

等