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Calendar.txt is the Simplest Time Planning System You Will Ever See

No complex apps; you just need to know the idea

This post can also be read on my blog

One Page Notebook update

Before getting into more calendar geekiness, a comment on the One Page Notebook, which I’m still using daily. Making the first fold parallel (rather than perpendicular) to the long edge gives you two double page spreads before needing to refold the page to reveal more writing space.

The calendar.txt concept

Calendar.txt is a completely manual way to plan your time and keep track of events. It makes an ideal companion to the todo.txt task management system. According to the calendar.txt documentation, “To use calendar.txt, you just need to know the idea.”

Calendar.txt rules

So here’s the idea:

1. Get yourself a list of dates
2. Write what you plan to do next to each date

And here are the rules:

• One thing per line
• Use date format (YYYY-MM-DD, e.g. 2025–09–29)
• Week starts Monday