Summarizes details of a
# S3 method for timeDate summary(object, ...)
Creates a summary report of the details of a
object. This includes the starting and end date, the number of dates
the format and the financial center in use.
Currently the function just prints the report and returns invisibly the object.
TODO: The return value return value should not be relied upon
since it is inconsistent with the way other methods for
work. They create an object with a print method and returned the object, which is typically printed but can also be assigned.