Calculating Timespans Between Dates in Years, Months, Days (AutoHotkey Function)

Calculating the Years, Months, and Days Between Two Points in Time Takes More Than Simple Mathematics

Years ago, I wrote an AutoHotkey timespan calculation function for keeping track of my grandkids ages. (I wrote about it in my Digging Deeper Into AutoHotkey e-book and you can find the original function in the GrandKids.ahk scripts.) Developing the function was a bit of a mindbender. As I remember, I just plowed through the project finding my way by trial-and-error. When I recently reviewed the script, I had a heck of a time figuring out what I had done. I know that I explained the steps in the book, but the script (even with the few comments) remained a mystery to me.

As I thought about it, I soon realized that I might write a better function if I changed how I viewed the problem. Continue reading