Java 8 时区转换
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Java 8 timezone conversions
提问by Javide
In Java 8, I want to convert a datetime from UTC to ACST (UTC+9:30).
在 Java 8 中，我想将日期时间从 UTC 转换为 ACST (UTC+9:30)。
input -> 2014-09-14T17:00:00+00:00
输入 -> 2014-09-14T17:00:00+00:00
output-> 2014-09-15 02:30:00
输出-> 2014-09-15 02:30:00
String isoDateTime = "2014-09-14T17:00:00+00:00";
LocalDateTime fromIsoDate = LocalDateTime.parse(isoDateTime, DateTimeFormatter.ISO_OFFSET_DATE_TIME);
ZoneOffset offset = ZoneOffset.of("+09:30");
OffsetDateTime acst = OffsetDateTime.of(fromIsoDate, offset);
System.out.println(acst.toString()); // 2014-09-14T17:00+09:30
System.out.println(acst.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)); // 2014-09-14T17:00:00+09:30
Why is the offset not performed?
为什么不执行偏移？
回答by aioobe
Try:
尝试：
String isoDateTime = "2014-09-14T17:00:00+00:00";
ZonedDateTime fromIsoDate = ZonedDateTime.parse(isoDateTime);
ZoneOffset offset = ZoneOffset.of("+09:30");
ZonedDateTime acst = fromIsoDate.withZoneSameInstant(offset);
System.out.println("Input: " + fromIsoDate);
System.out.println("Output: " + acst.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME));
Output:
输出：
Input: 2014-09-14T17:00Z
Output: 2014-09-15T02:30:00+09:30
Using OffsetDateTime
使用 OffsetDateTime
While it is generally better to use ZonedDateTimeas shown above, you can perform the same conversion using OffsetDateTimeas follows:
虽然ZonedDateTime如上所示使用通常更好，但您可以使用OffsetDateTime以下方法执行相同的转换：
String isoDateTime = "2014-09-14T17:00:00+00:00";
OffsetDateTime fromIsoDate = OffsetDateTime.parse(isoDateTime);
ZoneOffset offset = ZoneOffset.of("+09:30");
OffsetDateTime acst = fromIsoDate.withOffsetSameInstant(offset);
回答by bsandhu
Slight improvement on the above. Avoids hardcoding offset. Also, takes care of daylight savings.
以上略有改进。避免硬编码偏移。此外，还要注意夏令时。
public static LocalDateTime convertTo(LocalDateTime dateTime, String timeZone) {
ZoneId zone = ZoneId.of(timeZone);
ZonedDateTime zdt = dateTime.atZone(zone);
ZoneOffset offset = zdt.getOffset();
return dateTime.plus(offset.getTotalSeconds(), ChronoUnit.SECONDS);
}
