How to make time system

Question

Time system like Facebook or Twitter which I mean when you create tweets appear from 3 second or from 4 days .....
Is it make manually ? ?

Answer 1

Please can you explain clearly :)

Answer 2

Should i write it in javascript

Answer 3

I want it in java because I design an android app

Answer 4

2020 5/7 13:24:06
Like this for example.

The solution is to calculate the time difference with each time field in sequence
Right?