Showing and hiding chart items based on date and time
When you send chart items to Google Earth that have a date, time, or both, all items are initially mapped and a time slider is displayed.
The time span is from the earliest date/time of the mapped items to the latest date/time.
To select a period to view, move the time slider and Google Earth shows and hides the appropriate place marks.
Note: Date and time properties are used as start time, there is no
end time so as you advance the time slider, the collection of entities
and links increase until they are all visible.