Java ZonedDateTime 到 UTC 并应用偏移量？
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ZonedDateTime to UTC with offset applied?
提问by daydreamer
I am using Java 8
This is what my ZonedDateTimelooks like
我正在使用Java 8
这就是我的ZonedDateTime样子
2013-07-10T02:52:49+12:00
I get this value as
我得到这个值
z1.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)
where z1is a ZonedDateTime.
哪里z1是ZonedDateTime.
I wanted to convert this value as 2013-07-10T14:52:49
我想将此值转换为 2013-07-10T14:52:49
How can I do that?
我怎样才能做到这一点？
回答by SimMac
Is this what you want?
This converts your ZonedDateTimeto a LocalDateTimewith a given ZoneIdby converting your ZonedDateTimeto an Instantbefore.
这是你想要的吗？这种转换的ZonedDateTime一个LocalDateTime给定的ZoneId由您转换ZonedDateTime到Instant之前。
LocalDateTime localDateTime = LocalDateTime.ofInstant(z1.toInstant(), ZoneOffset.UTC);
Or maybe you want the users system-timezone instead of hardcoded UTC:
或者您可能想要用户系统时区而不是硬编码的 UTC：
LocalDateTime localDateTime = LocalDateTime.ofInstant(z1.toInstant(), ZoneId.systemDefault());
回答by Neero
@SimMac Thanks for the clarity. I also faced the same issue and able to find the answer based on his suggestion.
@SimMac 感谢您的清晰。我也遇到了同样的问题，并且能够根据他的建议找到答案。
public static void main(String[] args) {
try {
String dateTime = "MM/dd/yyyy HH:mm:ss";
String date = "09/17/2017 20:53:31";
Integer gmtPSTOffset = -8;
ZoneOffset offset = ZoneOffset.ofHours(gmtPSTOffset);
// String to LocalDateTime
LocalDateTime ldt = LocalDateTime.parse(date, DateTimeFormatter.ofPattern(dateTime));
// Set the generated LocalDateTime's TimeZone. In this case I set it to UTC
ZonedDateTime ldtUTC = ldt.atZone(ZoneOffset.UTC);
System.out.println("UTC time with Timezone : "+ldtUTC);
// Convert above UTC to PST. You can pass ZoneOffset or Zone for 2nd parameter
LocalDateTime ldtPST = LocalDateTime.ofInstant(ldtUTC.toInstant(), offset);
System.out.println("PST time without offset : "+ldtPST);
// If you want UTC time with timezone
ZoneId zoneId = ZoneId.of( "America/Los_Angeles" );
ZonedDateTime zdtPST = ldtUTC.toLocalDateTime().atZone(zoneId);
System.out.println("PST time with Offset and TimeZone : "+zdtPST);
} catch (Exception e) {
}
}
Output:
输出：
UTC time with Timezone : 2017-09-17T20:53:31Z
PST time without offset : 2017-09-17T12:53:31
PST time with Offset and TimeZone : 2017-09-17T20:53:31-08:00[America/Los_Angeles]
回答by DaveTPhD
It looks like you need to convert to the desired time zone (UTC) before sending it to the formatter.
看起来您需要先转换为所需的时区 (UTC)，然后再将其发送到格式化程序。
z1.withZoneSameInstant( ZoneId.of("UTC") )
.format( DateTimeFormatter.ISO_OFFSET_DATE_TIME )
should give you something like 2018-08-28T17:41:38.213Z
应该给你类似的东西 2018-08-28T17:41:38.213Z
