You can use data driven styling and style fill color by your timestamp field. This will show older items as lighter shades and newer items as darker shapes.
You could create a scripted field to return the age of each feature and use a custom color ramp to style based on age.
Apache, Apache Lucene, Apache Hadoop, Hadoop, HDFS and the yellow elephant
logo are trademarks of the
Apache Software Foundation
in the United States and/or other countries.