When can I reuse this calendar?

28 thomassmith65 6 9/5/2025, 12:49:44 AM whencanireusethiscalendar.com ↗

Comments (6)

rejectedstone · 4h ago
I think this is great and also applies to some planners. I suspect there would be issues with Holidays listed on the calendar that aren't based on set days (Easter, Jewish/Islamic Holidays, Chinese New Year, Holi, etc.).
KaseKun · 10h ago
This is ever so clever! When is your IPO?
thomassmith65 · 7h ago
I have nothing to do with this website.

The reason I chanced upon the site is because I thought a vintage calendar would make a nice gift for a friend of mine.

I then posted it to HN because I found it interesting.

porridgeraisin · 9h ago
The next time the calendar repeats.
CRConrad · 15h ago
Intuitively: Every seven years. Remembering leap years: In 28 years, tops.

Thinking about it: Has to be more often than that; there are only seven weekdays the year can begin on.

This is only considering getting the weekday for every date right; moon-phase stuff like the date of Easter will make it (much?) more rarely.

OK, will go read the article now...

netsharc · 7h ago
I guess there are only 14 variations: 7 for every weekday, times 2 for leap year or no leap year.