title: how to print previous 30 days from a date in python and the same in Tkinter
body: <p>I am using Tkinter to build a Corona Travel History Questionnaire.</p>
  
  <p>The front end has options to select a particular date - " D-Day Cronoa Confirmed".
  Once the D-day is confirmed, the program is supposed to give fields for entering data on travel history.</p>
  
  <p>I am using tkcalendar module in Python.</p>
  
  <p>Problem: How to print the previous 30 days from a given date in python?</p>
  
  <p>Question: Can we do anything in tkcalendar to print the last 30 days from a selected date in the window itself?</p>