解析后Java SimpleDateFormat错误的时区 [英] Java SimpleDateFormat Wrong Timezone after parsing
问题描述
为什么当我输入带有 GMT 时区的日期字符串时,SimpleDateFormat 会解析它并输出 EET 时区?
Why when i give input date string with GMT timezone, SimpleDateFormat parses it and outputs EET timezone?
public static String DATE_FORMAT="dd MMM yyyy hh:mm:ss z";
public static String CURRENT_DATE_STRING ="31 October 2011 11:19:56 GMT";
...
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(DATE_FORMAT, Locale.US);
simpleDateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
System.out.println(simpleDateFormat.parseObject(CURRENT_DATE_STRING));
输出为:2011 年 10 月 31 日星期一 13:19:56 EET而不是格林威治标准时间 2011 年 10 月 31 日星期一 13:19:56
And output is: Mon Oct 31 13:19:56 EET 2011 rather than Mon Oct 31 13:19:56 GMT 2011
推荐答案
您正在打印 Date.toString()
的结果.Date
没有任何时区概念——它只是自 UTC Unix 纪元以来的毫秒数.Date.toString()
始终使用系统默认时区.
You're printing out the result of Date.toString()
. A Date
doesn't have any concept of a timezone - it's just the number of milliseconds since the UTC Unix epoch. Date.toString()
always uses the system default time zone.
请注意,您不应该期待Mon Oct 31 13:19:56 GMT 2011",因为您指定的时间指定 GMT 小时为 11,而不是 13.
Note that you shouldn't be expecting "Mon Oct 31 13:19:56 GMT 2011" given that you've given a time which specifies a GMT hour of 11, not 13.
如果要使用特定时区进行打印,则应使用另一个DateFormat
进行打印,而不是使用Date.toString()
.(Date.toString()
不断造成这样的混乱;这真的很不幸.)
If you want to use a specific time zone for printing, you should use another DateFormat
for the printing, rather than using Date.toString()
. (Date.toString()
keeps causing confusion like this; it's really unfortunate.)
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