The dateTaken anchors a PhotoRecord to the day its image was captured, stored as a calendar date rather than a precise timestamp. This is what lets you reconstruct the photographic record of a project day by day, line photos up against the daily logs, and confirm when a particular context was documented. It is a required field, so no photo enters the catalogue without a shooting date, and the project's photo index uses it alongside the project to sort images chronologically.
Technical section
Data model, API, and internals — visible to developers.