Reading SAS time variables
#### Code Sample, a copy-pastable example if possible
#### Problem description
I tried to search to see if this issue was raised before, but could not find anything.

I notice that read_sas can convert SAS numbers formatted as DATE values (number of days since 1960) or DATETIME values (number of seconds since 1960) to datetime values supported by the datetime class in Python.  

But it does not include any logic to convert numbers formatted as TIME values (number of seconds since midnight) even though it looks like the datetime class in Python does support time of day values.

Why does read_sas not also convert those numbers? Is it because nobody actually uses that Python data type? Nobody asked for that feature?
