Changes

:*Time object code from '''Think Python''' [http://greenteapress.com/thinkpython2/html/thinkpython2017.html Chapter 16 ] and [http://greenteapress.com/thinkpython2/html/thinkpython2018.html Chapter 17]:*Date object [https://docs.python.org/3/reference/datamodel.html#special-method-names special method name]