Hmm, I like to look at it the other way around. Why go through the trouble of changing it, if there is no use case?
Like you said, I have never seen unix seconds logging in hexadecimal, octal or even binary form. And then there is always the scientific calculator to the rescue.

P.s. there is an epoch-calc sailfish version for your Jolla (https://openrepos.net/content/ade/epoch-calc).