Slice of the document formatter's metadata that signature extraction needs.
Optional
Facility-local timezone used to interpret timezone-naive EMR date strings (e.g. LightningStep "2026-06-01 10:00:00", Sunwave "03/10/2026 12:07:28 PM"). Defaults to America/New_York inside resolveISODate, consistent with EMRDocumentFormatter.
"2026-06-01 10:00:00"
"03/10/2026 12:07:28 PM"
resolveISODate
Slice of the document formatter's metadata that signature extraction needs.