英文:
How to find equality of hr, min in date
问题
我需要在Java中查找日期中小时和分钟的相等性（一个日期在夏时制后，另一个日期在夏时制结束后），这两个日期都处于UTC时区。英国于2020-10-26 早上2点结束夏时制，所以在上述示例中，小时和分钟是相等的。
- 日期1 = 2020-10-22T07:00:00+0000
- 日期2 = 2020-10-26T08:00:00+0000
英文:
I need to find equality of hour, minutes in date (1 date in DST, 1 date after DST) in java. Both dates are in UTC. DST ends in UK 2020-10-26 2 AM, so in above example, hour and minute are equal.
- Date1 = 2020-10-22T07:00:00+0000
- Date2 = 2020-10-26T08:00:00+0000
答案1
得分: 2
ZoneId zoneUk = ZoneId.of("Europe/London");
ZonedDateTime a = ZonedDateTime.parse("2020-10-22T07:00:00+00:00").withZoneSameInstant(zoneUk);
ZonedDateTime b = ZonedDateTime.parse("2020-10-26T08:00:00+00:00").withZoneSameInstant(zoneUk);
Notice the additional `:` in the time offset or it can't be parsed.
System.out.println(a); // 2020-10-22T08:00+01:00[Europe/London]
System.out.println(b); // 2020-10-26T08:00Z[Europe/London]
System.out.println(a.toLocalTime()); // 08:00
System.out.println(b.toLocalTime()); // 08:00
System.out.println(a.toLocalTime().equals(b.toLocalTime())); // true
英文:
ZoneId zoneUk = ZoneId.of("Europe/London");
ZonedDateTime a = ZonedDateTime.parse("2020-10-22T07:00:00+00:00").withZoneSameInstant(zoneUk);
ZonedDateTime b = ZonedDateTime.parse("2020-10-26T08:00:00+00:00").withZoneSameInstant(zoneUk);
Notice the additional : in the time offset or it can't be parsed.
System.out.println(a); // 2020-10-22T08:00+01:00[Europe/London]
System.out.println(b); // 2020-10-26T08:00Z[Europe/London]
System.out.println(a.toLocalTime()); // 08:00
System.out.println(b.toLocalTime()); // 08:00
System.out.println(a.toLocalTime().equals(b.toLocalTime())); // true
答案2
得分: 2
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
public class Main {
public static void main(String[] args) {
// 给定的日期时间字符串
String strDate1 = "2020-10-22T07:00:00+0000";
String strDate2 = "2020-10-26T08:00:00+0000";
// 为给定的日期时间字符串定义格式化程序
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("u-M-d'T'H:m:sZ");
// 英国的时区
ZoneId tzLondon = ZoneId.of("Europe/London");
// 获取在英国的对应日期时间
ZonedDateTime zdt1 = OffsetDateTime.parse(strDate1, formatter).atZoneSameInstant(tzLondon);
ZonedDateTime zdt2 = OffsetDateTime.parse(strDate2, formatter).atZoneSameInstant(tzLondon);
System.out.println(zdt1);
System.out.println(zdt2);
// 从 ZonedDateTime 获取本地时间
LocalTime lt1 = zdt1.toLocalTime();
LocalTime lt2 = zdt2.toLocalTime();
System.out.println(lt1);
System.out.println(lt2);
}
}
输出:
2020-10-22T08:00+01:00[Europe/London]
2020-10-26T08:00Z[Europe/London]
08:00
08:00
英文:
Your date-time strings have Zone-Offset of +0000 and therefore parsing them into OffsetDateTime (using an appropriate DateTimeFormatter) will be a more natural choice. Once you have parsed them into OffsetDateTime, convert them to the ZonedDateTime corresponding to the time-zone of the UK. As a final step, you need to get the local time part of the ZonedDateTime.
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
public class Main {
public static void main(String[] args) {
// The given date-time strings
String strDate1 = "2020-10-22T07:00:00+0000";
String strDate2 = "2020-10-26T08:00:00+0000";
// Define the formatter for the given date-time strings
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("u-M-d'T'H:m:sZ");
// ZoneId of the UK
ZoneId tzLondon = ZoneId.of("Europe/London");
// Get the corresponding date-time in the UK
ZonedDateTime zdt1 = OffsetDateTime.parse(strDate1, formatter).atZoneSameInstant(tzLondon);
ZonedDateTime zdt2 = OffsetDateTime.parse(strDate2, formatter).atZoneSameInstant(tzLondon);
System.out.println(zdt1);
System.out.println(zdt2);
// Get local date from ZonedDateTime
LocalTime lt1 = zdt1.toLocalTime();
LocalTime lt2 = zdt2.toLocalTime();
System.out.println(lt1);
System.out.println(lt2);
}
}
Output:
2020-10-22T08:00+01:00[Europe/London]
2020-10-26T08:00Z[Europe/London]
08:00
08:00
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