Does anyone have any suggestions on an e-day planner of sorts?

I suck at time management, always have. I’m just looking for a program or web application that’s free and relatively painless. I’m working with a combination of Excel and a physical notepad right now, and though functional, it is clunky as hell and makes me insane.

Preferably something that allows a bit of data input. I like to add notes and jargon to my itinerary (Read: jokes for myself, because I am a crazy person.)

Thanks y’all.