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GitHub Pages Jekyll build failed because a date is not a valid datetime

Date is not a valid datetime

GitHub Pages could not build the Jekyll site because a page or post contains a date value that Jekyll cannot parse as a valid datetime.

Date is not a valid datetimebuild errors
Date is not a valid datetime
  • A post or page front matter contains an invalid date value.
  • The date format does not match what Jekyll expects.
  • A malformed or incomplete timestamp is being parsed during the site build.
  1. Review front matter on posts and pages for invalid or malformed date values.
  2. Use a valid date or datetime format supported by Jekyll.
  3. Rebuild after correcting the file that contains the bad timestamp.
GitHub Docs: Troubleshooting Jekyll build errors for GitHub Pages sites
GitHub Pages date is not a valid datetime: causes and fixes | Error Atlas