Over the last few posts I've written about the unglamorous parts of building CountMyDays : counting days without off-by-one bugs, streak counters that survive midnight and DST, and "tomorrow" vs "in 2 days" labels that respect the reader's time zone. This one is different. It's less about code and more about intent: what this little app is for, and how I want it to age.

What CountMyDays is

CountMyDays is a free web app for two simple questions:

How long until something? A wedding, a trip, an exam, a birthday.

How long since something? A new habit, a quit date, an anniversary.

You type a name and a date, and you get a countdown or a count-up with a progress bar. You can share it with one link, add it to your calendar, put it in fullscreen on a big screen, or install it to your home screen like an app. There are no ads, and you don't need an account to start.…