This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
Post
Phil Nash
philna.sh
did:plc:dilpwaz4g3n63fqhmzixsi63
Wrote a new blog post. This is the story of how I tried to add one month to a JavaScript date and discovered the result was 9 months earlier.
Yes, the problem was time zones. Even though the time didn't matter.
https://philna.sh/blog/2026/01/11/javascript-date-calculation/
2026-01-12T03:34:44.528Z