计算两个时刻之间的天、小时和分钟

date time java java.time.instant

2022-09-01 18:11:31

我有一个即时格式化如下：

DateTimeFormatter formatter = 
 DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT )
                                 .withLocale( Locale.UK )
                                 .withZone( ZoneId.of("UTC"));

String instant = formatter.format(Instant.now()).toString();

我想计算即时和即时之间的天，小时和分钟（如果可能的话）.now（），类似于：

// for days
String daysBetween = Instant.now() - instant;

我可以这样做吗？

答案 1

要计算两个对象之间的天、小时和/或分钟：Instant

Instant instant1 = Instant.parse("2019-02-14T18:42:00Z");
Instant instant2 = Instant.parse("2019-04-21T05:25:00Z");

// If you only need one of them
System.out.println(ChronoUnit.DAYS.between(instant1, instant2));    // prints: 65
System.out.println(ChronoUnit.HOURS.between(instant1, instant2));   // prints: 1570
System.out.println(ChronoUnit.MINUTES.between(instant1, instant2)); // prints: 94243

// Or use alternate syntax (it's the same thing)
System.out.println(instant1.until(instant2, ChronoUnit.DAYS));    // prints: 65
System.out.println(instant1.until(instant2, ChronoUnit.HOURS));   // prints: 1570
System.out.println(instant1.until(instant2, ChronoUnit.MINUTES)); // prints: 94243

// Or use Duration
Duration duration = Duration.between(instant1, instant2);
System.out.println(duration.toDays());    // prints: 65
System.out.println(duration.toHours());   // prints: 1570
System.out.println(duration.toMinutes()); // prints: 94243

// In Java 9+, Duration can give them as parts to be used together
System.out.println(duration.toDaysPart());    // prints: 65
System.out.println(duration.toHoursPart());   // prints: 10
System.out.println(duration.toMinutesPart()); // prints: 43

// Or you can calculate the parts yourself, using epoch seconds
long seconds = instant2.getEpochSecond() - instant1.getEpochSecond();
System.out.println(seconds / 86400);     // prints: 65
System.out.println(seconds / 3600 % 24); // prints: 10
System.out.println(seconds / 60 % 60);   // prints: 43

正如您在最后两个中看到的，给定样本日期的差异为 65 天、10 小时和 43 分钟。

答案 2