API Reference > imodel-components-react > Timeline > TimelineDateMarkerProps > dateMarker dateMarker dateMarker: undefined | ReactNode ReactNode to use as the marker on the timeline. If undefined, a short vertical bar will mark the date. Defined in ui/imodel-components-react/src/imodel-components-react/timeline/TimelineComponent.tsx Line 53 Last Updated: 30 November, 2023