fix a small calc.php bug, and add date information to the time module. the changes have been sitting on a branch for like a week, so I figured I'd cherry-pick them over to this branch for a PR.
[as always, these changes are live on my instance.](https://4get.silly.computer/web?s=what+is+the+date&scraper=yandex&nsfw=yes)
Reviewed-on: lolcat/4get#15
Co-authored-by: cynic <admin@cynic.moe>
Co-committed-by: cynic <admin@cynic.moe>
incl. a calculator, a hash encoder + rot13 and b64!, and a "what time is it" with timezone selection
frontend injected in $payload["left"] in web.php
you can see this live [on my instance](https://4get.silly.computer/web?s=7%2B8(9%5E2)&scraper=brave&nsfw=yes) (there are some issues that aren't related to this PR. favicons, etc. I'll fix them later.)
Reviewed-on: lolcat/4get#10
Co-authored-by: cynic <admin@cynic.moe>
Co-committed-by: cynic <admin@cynic.moe>
cynic