blocks|key|1791779|text|Duration是错误的类。在一个时区的"now“和另一个时区的"now”之间没有持续时间。有关这方面的有趣但令人难忘的思考方式，请参阅here。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1791780|您似乎想知道给定时区与UTC的当前偏移量。为此，您可以使用ZonedDateTime类：|1791781|ZonedDateTime+zdt+=+ZonedDateTime.now(ZoneId.of("Asia/Kolkata"));
ZoneOffset+offset+=+zdt.getOffset();
int+offsetMinutes+=+offset.getTotalSeconds()+/+60;
double+offsetHours+=+((double)+offsetMinutes)+/+60;
System.out.println(offsetHours);++//+5.5|code-block|syntax|javascript|1791782|如果您想使用计算机的当前时区，也可以只在第一行使用ZonedDateTime.now()。|1791783|关于LocalTime+-这只是时间部分(小时、分钟、秒和更小)。由于没有关联的日期，您不一定能确定它属于哪个时区偏移量。在任何给定的时刻，都有不止一个“今天”的日期在发生。时区偏移量的范围从UTC-12到UTC%2B14，因此确实存在在地球上某处同一天的两个不同日期发生相同时间的值。|1791784|例如，2019-01-01夏威夷的08:00:00+(Pacific/Honolulu)也是基里巴斯的08:00:00+(Pacific/Kiritimati)，但是2019-01-02+-第二天！(Reference+here.)因此，如果你有一个带有08:00:00的LocalTime对象，并且它在这两个区域中的一个区域是08:00:00，你将无法分辨它是哪个区域，或者相应的UTC偏移应该是什么。|1791785|此外，请记住，时区偏移量不限于整个小时。现在的时区有半小时和45分钟的时差。从历史上看，还有其他的。|1791786|最后，请记住，偏移量不一定足以识别时区。许多时区在某些时间点共享偏移量，但在其他时间点不同。请参阅the+timezone+tag+wiki中的“时区!=偏移”。|1791787|哦，关于你的结果，在一个方向上得到2，在另一个方向上得到-3+-这是由于你的整数除法造成的舍入误差。如果打印出秒值，您会注意到它们相差一秒(10799，vs+-10800)。仔细研究一下，您会发现"now“包含了被getSeconds调用截断的小数秒。(您调用了.now()两次，因此它们的时间略有不同。)|1791788|entityMap|0|LINK|mutability|MUTABLE|url|https://dilbert.com/strip/1998-03-14|1|https://www.timeanddate.com/worldclock/converter.html?iso=20190101T180000&p1=tz_hast&p2=274|2|https://stackoverflow.com/tags/timezone/info^0|0|8|1W|4|0|0|T|D|0|0|P|J|0|2|9|0|H|8|R|G|1F|8|1P|I|3J|8|3S|9|4K|8|2S|F|1|0|0|1D|L|2|0|H|1|S|2|1Y|5|27|6|2Z|A|3N|6|0^^$0|@$1|2|3|4|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|F|3|G|5|6|7|1G|8|@$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1J|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1K|8|@$9|1L|A|1M|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1N|8|@$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1Q|8|@$9|1R|A|1S|B|C]|$9|1T|A|1U|B|C]|$9|1V|A|1W|B|C]|$9|1X|A|1Y|B|C]|$9|1Z|A|20|B|C]|$9|21|A|22|B|C]|$9|23|A|24|B|C]]|D|@$9|25|A|26|1|27]]|E|$]]|$1|S|3|T|5|6|7|28|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|29|8|@]|D|@$9|2A|A|2B|1|2C]]|E|$]]|$1|W|3|X|5|6|7|2D|8|@$9|2E|A|2F|B|C]|$9|2G|A|2H|B|C]|$9|2I|A|2J|B|C]|$9|2K|A|2L|B|C]|$9|2M|A|2N|B|C]|$9|2O|A|2P|B|C]]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|2Q|8|@]|D|@]|E|$]]]|Z|$10|$5|11|12|13|E|$14|15]]|16|$5|11|12|13|E|$14|17]]|18|$5|11|12|13|E|$14|19]]]]

<code>Duration</code> is the wrong class. There is zero duration between "now" in one time zone and "now" in another. For a fun but memorable way to think about this, see <a href="https://dilbert.com/strip/1998-03-14" rel="nofollow noreferrer">here</a>.

You appear to be seeking to know the current offset from UTC for a given time zone. You can use the <code>ZonedDateTime</code> class for that:

<pre><code>ZonedDateTime zdt = ZonedDateTime.now(ZoneId.of("Asia/Kolkata"));
ZoneOffset offset = zdt.getOffset();
int offsetMinutes = offset.getTotalSeconds() / 60;
double offsetHours = ((double) offsetMinutes) / 60;
System.out.println(offsetHours); // 5.5
</code></pre>

You could also just use <code>ZonedDateTime.now()</code> on the first line, if you want to use the computer's current time zone.

With regard to <code>LocalTime</code> - that is just the time portion (hours, minutes, seconds, and smaller). Since there is no date associated, you can't necessarily determine which time zone offset it belongs to. There is more than one date that "today" going on at any given moment. Time zone offsets range from UTC-12 to UTC+14, so there are indeed values where the same time of day is happening on two different dates somewhere on the planet.

As an example, <code>08:00:00</code> in Hawaii (<code>Pacific/Honolulu</code>) on 2019-01-01 is also <code>08:00:00</code> in Kiribati (<code>Pacific/Kiritimati</code>), but on 2019-01-02 - the following date! (<a href="https://www.timeanddate.com/worldclock/converter.html?iso=20190101T180000&amp;p1=tz_hast&amp;p2=274" rel="nofollow noreferrer">Reference here.</a>) Thus, if you had a <code>LocalTime</code> object with <code>08:00:00</code> and it was <code>08:00:00</code> in one of those two zones, you'd not be able to tell which one it was, or what the corresponding UTC offset should be.

Also, keep in mind that time zone offsets are not limited to whole hours. There are present-day time zones with half-hour and 45-minute offset. Historically, there have been others.

Lastly, keep in mind that an offset is not necessarily enough to identify a time zone. Many time zones share offsets at some points in time, but differ in others. See "Time Zone != Offset" in <a href="https://stackoverflow.com/tags/timezone/info">the timezone tag wiki</a>.

Oh, and about your results getting <code>2</code> in one direction and <code>-3</code> in the other - this is a rounding error due to your integer division. If you print out the seconds value, you'll notice they are one second apart (<code>10799</code>, vs <code>-10800</code>). Dig closer and you'll find that "now" included fractional seconds that were truncated with the <code>getSeconds</code> call. (You called <code>.now()</code> twice, so they were at slightly different times.)

I want to get a difference in hours between a current time in a specific timezone and UTC time. I tried this:

<pre><code> LocalTime time = LocalTime.now();
 System.out.println(time); //21:05:42:764

 LocalTime utcTime = LocalTime.now(ZoneId.of("UTC"));
 System.out.println(utcTime); //18:05:42:769

 System.out.println(Duration.between(utcTime, time).getSeconds()/3600); //2
 System.out.println(Duration.between(time, utcTime).getSeconds()/3600); //-3
</code></pre>

Why is the difference between the last two results and are there better ways to do it? I need to get the number 3.

java.time: the simplest way to get a difference in hours between two LocalTime objects

我想要获取特定时区中的当前时间与UTC时间之间的小时差。我试过这个： LocalTime time = LocalTime.now(); System.out.println(time); //21:05:42:764 LocalTime utcTime = LocalTime.now(ZoneId.of("UTC")...

问java.time:获取两个LocalTime对象之间小时数差异的最简单方法
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