In Pirandello's Six Characters in Search of an Author, how does the time frame work?

Like other Modernist works, Six Characters in
Search of an Author defies the chronological and linear development of the
events. In Pirandello's play, the mixing of past and present in the narrative is also
instrumental in blurring the boundaries between reality and illusion. The present in the
play is represented by the rehearsals which are interrupted by the arrival of the six
characters. These begin to narrate the events of the play they're trying to finish,
events that are part of the past. Yet, some of these past events in the lives of the
characters are re-enacted in the present of the rehearsals, thus generating more
ambiguity as far as reality and illusion are concerned. For example, in the second act,
the Father and the Step-daughter re-enact their encounter at Madame Pace's brothel. In
the third act, the past events recalled in the play are the deaths of the Little Boy and
the Little Girl. The Little Boy's death, however, is questioned and we're left wondering
whether it ever happened.