Me and my sister got in a fat argument over gaming (GEEZ!)

I realize I play a lot of games at this point b/c I'm bored, but if things get better (I hope they will soon and if they do you'll hear it in the win thread later) I figure I need to manage my time better so I can have my fun and get everything done. I once used Franklin Day Planner, but I'm thinking about changing that to a app. (Prolly will cost less too.)

Is there some kinda day planner app that syncs between Windows 10 and Android that I could use? Thanks for everyone who can help. (Oh and before you ask, when I have to do that, I'm planning on using a timer on games so I don't play too long! As in, set a timer on my phone. And going to time how long it takes on avg for me to beat a boss just so I can add a cushion to that long enough for me to save or gtfo depending.)