Period.
to_timestamp
Return the Timestamp representation of the Period.
Uses the target frequency specified at the part of the period specified by how, which is either Start or Finish.
Target frequency. Default is ‘D’ if self.freq is week or longer and ‘S’ otherwise.
One of ‘S’, ‘E’. Can be aliased as case insensitive ‘Start’, ‘Finish’, ‘Begin’, ‘End’.