What is the author's style in Sunrise at Campobello by Dore Schary?

The play is a chronicle of the events from a specific time period in FDR's political history, namely, the thirty-four months leading up to a public appearance that would change his political destiny. Action occurring in a given act is presented in chronological order, indicated at the beginning of an act by date, affirming the historical authenticity and significance of the events of the work. The effort FDR makes personally and politically to overcome his illness forms the framework for the play.