将任何时区的日期和时间转换为UTC区域 [英] convert date and time in any timezone to UTC zone

问题描述

• 这是我的约会日期15-05-2014 00:00:00

• this is my date " 15-05-2014 00:00:00 "

如何转换IST到UTC ie（到14-05-2014 18:30:00）

how to convert IST to UTC i.e( to 14-05-2014 18:30:00)

我的代码是

DateFormat formatter = new SimpleDateFormat("dd MMM yyyy HH:mm:ss");

formatter.setTimeZone(TimeZone.getTimeZone("IST"));  //here set timezone

System.out.println(formatter.format(date));  
formatter.setTimeZone(TimeZone.getTimeZone("UTC"));  //static UTC timezone

System.out.println(formatter.format(date));  
String str = formatter.format(date);
Date date1  = formatter.parse(str);
System.out.println(date1.toString());

• 如果用户从任何区域输入相同的日期，那么将获得UTC时间（例如：从澳大利亚然后15-05-2014 00:00:00到14-05-2014 16:00:00）

  • if user enter same date from any zone then will get UTC time(ex: from Australia then 15-05-2014 00:00:00 to 14-05-2014 16:00:00)

    请任何建议。

    推荐答案

    您无法将该日期值转换为其他时区或UTC。类型 java.util.Date 没有任何内部时区状态，只能通过规范引用UTC，其方式无法通过user（仅计算UTC时区中自UNIX时代以来的毫秒数，而不考虑leapseconds）。

    You cannot "convert that date values" to other timezones or UTC. The type java.util.Date does not have any internal timezone state and only refers to UTC by spec in a way which cannot be changed by user (just counting the milliseconds since UNIX epoch in UTC timezone leaving aside leapseconds).

    但您可以转换<$ c $的格式化字符串表示形式c> java.util.Date 到另一个时区。我更喜欢使用两种不同的格式化程序，每个时区（和模式）一个。我也更喜欢在你的情况下使用亚洲/加尔各答，因为它将普遍起作用（IST也可能是以色列标准时间，在以色列将有不同的解释）：

    But you can convert the formatted String-representation of a java.util.Date to another timezone. I prefer to use two different formatters, one per timezone (and pattern). I also prefer to use "Asia/Kolkata" in your case because then it will universally works (IST could also be "Israel Standard Time" which will be interpreted differently in Israel):

    DateFormat formatterIST = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
    formatterIST.setTimeZone(TimeZone.getTimeZone("Asia/Kolkata")); // better than using IST
    Date date = formatterIST.parse("15-05-2014 00:00:00");
    System.out.println(formatterIST.format(date)); // output: 15-05-2014 00:00:00
    
    DateFormat formatterUTC = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
    formatterUTC.setTimeZone(TimeZone.getTimeZone("UTC")); // UTC timezone
    System.out.println(formatterUTC.format(date)); // output: 14-05-2014 18:30:00
    
    // output in system timezone using pattern "EEE MMM dd HH:mm:ss zzz yyyy"
    System.out.println(date.toString()); // output in my timezone: Wed May 14 20:30:00 CEST 2014
    

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