Anthropath stores years internally with astronomical numbering, where 1 BCE is 0 and 500 BCE is -499. Public pages still show familiar BCE and CE dates.
Timeline records can carry a possible range and a likely range. The possible range is drawn as a pale band, while the likely range is drawn as a solid band. Traditional, legendary, disputed, and weakly evidenced chronology uses dashed or reduced-emphasis styling.
Published records are expected to include machine-readable dates, a confidence level, a summary, a domain, a culture or global context, and at least one source.