Show HN: What's today's date if we used a perrenial calendar (bettercalendars.com)

I was thinking about a decimal clock as totally normal people sometimes do and eventually ended up doing some research about a decimal calendar (which might sound appealing at first, but ends up being very impractical) and came across other calendar proposals.

I wondered what dates today, my birthday, and holidays would be on those calendars and how one would find that information. I looked for websites that did what Better calendars does, but couldn't find any that I found appealing so I decided to build it myself.