Coerce date front-matter into a YYYY-MM-DD string. Accepts a Date (gray-matter parses ISO dates eagerly), a string starting with YYYY-MM-DD, or falls back to "today".
date
YYYY-MM-DD
Date
The date: field as returned by gray-matter.
date:
Injection seam for "today" — defaults to new Date(). Tests pass a frozen clock to make assertions deterministic.
new Date()
A YYYY-MM-DD string.
Coerce
datefront-matter into aYYYY-MM-DDstring. Accepts aDate(gray-matter parses ISO dates eagerly), a string starting withYYYY-MM-DD, or falls back to "today".