https://play.date/ currently looks broken because various https resources it uses is being served with certificate errors (ERR_CERT_DATE_INVALID).
This can be reproduced by going to https://static-cdn.play.date/ in either Chrome or Firefox, and observe the connection error. Note that the screenshot also looks broken because it's served from devforum-cdn.play.date, which also has a certificate error.
I am still able to access this forum due to browser cache, but the broken page is what I get when I visit in incognito mode.