Added date-rules.js file.
Added date-rules.js file.

Added the primary file of project.

Former-commit-id: 1816a47a073dd325ebc6a5780ef0673fd1c5d55f
bfg-repo-cleaner-demos/jsdelivr-bfg-cleaned,bfg-repo-cleaner-demos/jsdelivr-bfg-cleaned,bfg-repo-cleaner-demos/jsdelivr-bfg-cleaned,bfg-repo-cleaner-demos/jsdelivr-bfg-cleaned