Click on the Records tab and open the record you'd like to connect to the timeline.
Click on the Styles tab, and click in the Widgets box. Select SIMILE Timeline.
Scroll down to the Dates field set.
Enter s Start Date. Use the format yyyy-mm-dd (for example, 2016-10-21).
Enter an End Date (if appropriate).
Click Save at the bottom of the form. The map should appear as a span on the timeline.
Next, let’s configure the record so that it’s only visible on the map between those two dates (right now it is always “on”). Go down to the Dates field set and enter “1854-01-01” in the After Date input and “1905-01-01” in the Before Date field. Now, the map will only be visible when the “center” line on the timeline falls between those dates.