+ Code to simply get the last modified time

- Realized I have wrongly been getting last modified time of file from
S3 :( :(
+ Last modified time from local system is required
+ Added code to get it in Epoch Time format
+ Epoch time is # of elapsed seconds from 1 January 1970
+ It returns an int , unlike other time / calendar / datetime python
modules ( Also realized python’s time modules are so scattered and
haphazard )