问题
I have an instant formatted like this:
DateTimeFormatter formatter =
DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT )
.withLocale( Locale.UK )
.withZone( ZoneId.of("UTC"));
String instant = formatter.format(Instant.now()).toString();
and i want to calculate the days, hours and minutes (if possible) between the instant and Instant.now(), something like:
// for days
String daysBetween = Instant.now() - instant;
can i do that ?
回答1:
To calculate days, hours and/or minutes between two Instant
objects:
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
As you can see in the last two, the difference is 65 days, 10 hours, and 43 minutes for the given sample dates.
来源:https://stackoverflow.com/questions/55779996/calculate-days-hours-and-minutes-between-two-instants