java timezone name 'summer' should be 'daylight'
在澳大利亚,新南威尔士州和昆士兰州的经度相同。 然而,在夏季,人们会观察到夏令时,而另一个则没有。
因此,他们一半的时间相隔1小时。
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QLD全年和冬季新南威尔士州在时区"澳大利亚
东部标准时间"(AEST)并且是GMT + 10 -
夏天新南威尔士州
时区被称为"澳大利亚东部夏令时"(AEDT)和
格林尼治标准时间+11
然而,根据Java AEST = EST(东部标准时间)和AEDT = EST(东部夏令时)
因此,使用SimpleDateFormat,如果不打印完整的时区名称,就无法区分它们:
1 2 3 4 5 6 7 8 9 10 | // printing the same date with different timezones // using new SimpleDateFormat("dd/MM/yyyy HH:mm z") 26/12/2014 06:00 EST 26/12/2014 07:00 EST // cannot tell the difference ^ // using new SimpleDateFormat("dd/MM/yyyy HH:mm z X zzzz") 26/12/2014 06:00 EST +10 Eastern Standard Time (Queensland) 26/12/2014 07:00 EST +11 Eastern Summer Time (New South Wales) |
这是java中的错误吗? 可以修补SimpleDateFormat或TimeZone吗?
在
ID - the ID for a TimeZone, either an abbreviation such as"PST", a full name such as"America/Los_Angeles", or a custom ID such as"GMT-8:00". Note that the support of abbreviations is for JDK 1.1.x compatibility only and full names should be used.
我们可以使用
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如果我们使用时区的全名,我们会发现夏令时是正确的。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | Date now = new Date(); TimeZone timeZoneQLD = TimeZone.getTimeZone("Australia/Queensland"); TimeZone timeZoneNSW = TimeZone.getTimeZone("Australia/NSW"); DateFormat formatQLD = new SimpleDateFormat("dd/MM/yyyy HH:mm Z"); DateFormat formatNSW = new SimpleDateFormat("dd/MM/yyyy HH:mm Z"); formatQLD.setTimeZone(timeZoneQLD); formatNSW.setTimeZone(timeZoneNSW); System.out.println("Queensland"); System.out.println(formatQLD.format(now)); System.out.println("DST saving" + timeZoneQLD.useDaylightTime()); System.out.println(); System.out.println("New South Wales"); System.out.println(formatNSW.format(now)); System.out.println("DST saving" + timeZoneNSW.useDaylightTime()); |
输出:
1 2 3 4 5 6 7 | Queensland 11/03/2015 03:06 +1000 DST saving false New South Wales 11/03/2015 04:06 +1100 DST saving true |