Goofing up date and time calculations.
No matter how many programming languages I learn (I know quite a few), one thing I will never master is date and time calculations. In times past, I have even called my self the april fool of programming. Name calling isn't the solution to the problem. There isn't a solution!
I realized just how bad I am at date and time calculations when testing Log Mine, Log Mine very embarrasingly shows 31 days for the month of February. I have used a very tedious calculation to derive the number of days in a month. Turns out all I need to do is to call the date function with the time stamp and the parameter 't'.