Python Dates and Times in Python Where on Earth do Timezones Make Sense? pytz Format

Challenge

This is for challenge task 1 and I don't understand it

pytzstring.py
import datetime
import pytz

fmt = '%m-%d %H:%M %Z%z'
starter = datetime.datetime(2015, 10, 21, 4, 29)
local = starter.localize('US/Eastern')