class Chronic::Parser

def guess(span, mode = :middle)

Returns a new Time object.

span - The Chronic::Span object to calcuate a guess from.

Guess a specific time within the given span. 
def guess(span, mode = :middle)
  return span if not mode
  return span.begin + span.width / 2 if span.width > 1 and (mode == true or mode == :middle)
  return span.end if mode == :end
  span.begin
end