Hehe, I wasn't even sure this word existed in english. I wrote it as on-the-fly translation of the french "Posologie" that I knew about. I find it easier to understand the code when not having to deal with x=y and y=r+u-t. That's quite a wall you wrote there as your solution :). Keep up the good work!

P.S. I should have used moment to get date diff but I didn't know how to include the library in the editor.