Why is adding weeks to java.time.Instant not supported?

Question

The following piece of code:

Instant inFourWeeks = Instant.now().plus(4L, ChronoUnit.WEEKS);

Throws an exception:

java.time         


        

Answer 1

It throws UnsupportedTemporalTypeException 7 days week is not universal and constant. It may vary of different calendar system. For example, look on the Akan calendar system which uses 6 days a week.