I've used a Google Sheet exactly like this. Highlighted weekends and laid out with all days of the year. Export as PDF can fit on a single sheet of paper. But I also print it out on a huge paper and hang it up for my family. [https://bettersheets.co/bigyear]
Man, a marketing landing page for a calendar. That's really something.
I doubt HN is your market. Everything about that page made me want to run in fear. And I don't trust your download link.
I expected some dude's blog with an .xlsx upload or something. I would have a lot more trust there.
What am I giving up by using yours? What's in it for you?