It is very simple, that you might not need a library, although there are cautions. That is, using Date object. Be aware of months and leap years. Don't try to use straight simple approximation of raw milliseconds. Let me say this first. I still have ...
So, I got my hands on an 8-years-old MacBook Pro (mid 2012), with 4GB RAM, 500GB SATA HD, and Core i5 CPU. Good thing about this, is 500GB is very large. (Compared to nowadays usual small (but faster SSD) 128GB - too small to dual boot.) My MacBook P...