英文:
Timezone methods not changing the current Instant time
问题
我想返回特定时区（TimeZone）的当前时间（Instant）：我尝试了以下代码块：
Instant now2 = Instant.now();
ZonedDateTime zdt = ZonedDateTime.ofInstant(now2, ZoneId.of("Asia/Singapore"));
System.out.println("Singapore" + zdt.toInstant());
或者也可以尝试：
Instant nowUtc = Instant.now();
ZoneId asiaSingapore = ZoneId.of("Asia/Singapore");
ZonedDateTime nowAsiaSingapore = ZonedDateTime.ofInstant(nowUtc, asiaSingapore);
或者：
Instant timeStamp = Instant.now();
ZonedDateTime timestampAtGMTPlus1 = timeStamp.atZone(ZoneId.of("GMT+02:00"));
Instant nowGMT = timestampAtGMTPlus1.toInstant();
System.out.println("In 'GMT+01:00' Time Zone:" + nowGMT);
但似乎都没有产生与当前时间（Instant.now()）不同的时间。是否需要先进行时区设置？我的 Instant 类（Java 8）有什么问题？
更新：在这三种方法中，结果都是 2020-08-04T16:08:59.062Z。
对于 Mathew：您的解决方案输出 23:08:59.063594500，这对我来说没有提供足够的信息。
英文:
I want to return the current time (Instant) in a certain TimeZone : I tried with the following chunks of code :
Instant now2 = Instant.now();
ZonedDateTime zdt = ZonedDateTime.ofInstant(now2,
ZoneId.of("Asia/Singapore"));
System.out.println("Singapore"+ zdt.toInstant());
with this :
Instant nowUtc = Instant.now();
ZoneId asiaSingapore = ZoneId.of("Asia/Singapore");
ZonedDateTime nowAsiaSingapore = ZonedDateTime.ofInstant(nowUtc, asiaSingapore);
or also :
Instant timeStamp= Instant.now();
ZonedDateTime timestampAtGMTPlus1= timeStamp.atZone(ZoneId.of("GMT+02:00"));
Instant nowGMT = timestampAtGMTPlus1.toInstant();
System.out.println("In 'GMT+01:00' Time Zone:"+ nowGMT);
But neither seems to be producing any different time from the current one (Instant.now())
Is there a prior config to set for the timezone to be modified ?
What's wrong with my Instant Class (Java 8) ?
UPDATE : in all three the result is 2020-08-04T16:08:59.062Z
For Mathew : your solution is outputting : 23:08:59.063594500 which is a no-information to me.
答案1
得分: 1
Instant总是UTC时间。你要找的类叫做LocalTime：
Instant now = Instant.now();
ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(now, ZoneId.of("Asia/Singapore"));
System.out.println("The time in Singapore is: " + zonedDateTime.toLocalDateTime());
zonedDateTime = ZonedDateTime.ofInstant(now, ZoneId.of("Europe/London"));
System.out.println("The time in London is: " + zonedDateTime.toLocalDateTime());
输出结果：
新加坡的时间是：2020-08-04T23:21:00.238406800
伦敦的时间是：2020-08-04T16:21:00.238406800
英文:
Instant is always UTC. The class you are looking for is called LocalTime:
Instant now = Instant.now();
ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(now, ZoneId.of("Asia/Singapore"));
System.out.println("The time in Singapore is: " + zonedDateTime.toLocalDateTime());
zonedDateTime = ZonedDateTime.ofInstant(now, ZoneId.of("Europe/London"));
System.out.println("The time in London is: " + zonedDateTime.toLocalDateTime());
Gives:
The time in Singapore is: 2020-08-04T23:21:00.238406800
The time in London is: 2020-08-04T16:21:00.238406800
答案2
得分: 0
你可以尝试这样做：
ZoneId asiaSingapore = ZoneId.of("Asia/Singapore");
Instant inst = LocalDateTime.now(asiaSingapore).toInstant(ZoneOffset.UTC);
System.out.println(inst);
英文:
You may try like this
ZoneId asiaSingapore = ZoneId.of("Asia/Singapore");
Instant inst = LocalDateTime.now(asiaSingapore).toInstant(ZoneOffset.UTC);
System.out.println(inst);
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