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Java Years from 2 Instants

In Iodine, we can calculate the years between two days of time using

Years.between(dateTime1, dateTime2);

Is there an easy way to find years between two points using the java.time API, and not without logic?

 ChronoUnit.YEARS.between(instant1, instant2)

fails:

 Exception in thread "main" java.time.temporal.UnsupportedTemporalTypeException: Unsupported unit: Years at java.time.Instant.until(Instant.java:1157) at java.time.temporal.ChronoUnit.between(ChronoUnit.java:272) ...
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1 answer

The number of years between two moments is considered undefined (apparently - I was surprised by this), but you can easily convert moments to ZonedDateTime and get a useful result:

 Instant now = Instant.now(); Instant ago = Instant.ofEpochSecond(1234567890L); System.out.println(ChronoUnit.YEARS.between( ago.atZone(ZoneId.systemDefault()), now.atZone(ZoneId.systemDefault())));

Print

 8

I suspect that the reason you can’t directly compare the moments is because the location of the year’s border depends on the time zone. This means that ZoneId.systemDefault() may not be what you want! ZoneOffset.UTC would be a smart choice, otherwise if there is a more meaningful time zone in your context (for example, the time zone of the user who sees the result), you should use it.

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Source: https://habr.com/ru/post/1273376/

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