pub fn normalize_for_write(text: &str) -> Result<String, InvalidDue>Expand description
Canonicalize a due value at the moment it is persisted.
Fully qualified dates keep their year, including dates in the past.
Shorthand values name their next occurrence: a past MM-DD rolls to a
later year and a past HH:MM rolls to tomorrow. The stored result is
always an absolute YYYY-MM-DD date, optionally followed by HH:MM.