[Lang] Rounding Duration

[Aleksander Ściborek]

Hello everyone
During implamanting a feauture in Java I noticed that there is no methods
to round duration for instance:
between 10:00 and 12:31 there is 2h 31 min. I want to write some methods to
reduce boilerplate code to calculate  time in given unit between temporals
and round this time - e.g. for 2 h 31 minutes it should return 3 hours
Aleksander