How to find out the date of the last Saturday in Linux shell script or python?

Question

I have python script which i need to run daily for backups. Now i need to find the date of last saturday because i need that in my script to get the backups i did on last sa

Answer 1

In python script:

from datetime import date
from datetime import timedelta
today = date.today()
last_saturday = today - timedelta(days= (today.weekday() - 5) % 7)

Answer 2

On Mac OS it would be:

$ date -v -sat +"%b-%d-%Y"
Mar-28-2015

Answer 3

$ date +"%b-%d-%Y" -d "last saturday"
Jul-13-2013