This demo showcases how to display the additional header rows on timeline view. In this demo, an additional row for displaying month and week number has been added.
Unlike the usual date and time rows, timeline view can be displayed with additional header rows to display the years, months
and week numbers. To do so, define the headerRows property which accepts an array of object and each object includes the
option API to define the specific header row type such as Year, Month, Week and
Date. The object also includes the template option to provide label customization on these rows. This
headerRows property is application only on timeline views.