CODEWITHSUNDEEP
linuxdate
Dhruuv
Dhruuv

Reputation: 343

Getting a day date for last week from a given date

I know how to get the last Saturday date using date --date="sat. last week" +"%m%d%Y" However, I am unable to get the last Saturday date for a particular given date.

I am trying to find the date of last saturday date from a given date. For an instance, let us say that the given date is 20140605 (in YYYYMMDD format) or any weekday date from that particular week. This given date could be any weekday date (20140602-20140606) in the following week for that Saturday, I need to derive the Saturday date for the week before this date which would be (in my case)= 20140531. How can I achieve this?

Upvotes: 1

Views: 144

Answers (2)

dmansfield
dmansfield

Reputation: 1128

I just barfed a bit on my keyboard, but this seems to work:

D="20140605"; date --date "$D $[($(date --date "$D" +%u) + 1) % 7] days ago" +"%Y%m%d"

Upvotes: 2

Dr. Jan-Philip Gehrcke
Dr. Jan-Philip Gehrcke

Reputation: 35731

I have a small Python snippet for you:

from datetime import datetime, timedelta
import sys


fmt = "%Y%m%d"
daystring = sys.argv[1]
day = datetime.strptime(daystring, fmt)


for d in range(7):
    # Go back a few days, but not more than 6.
    testdate = day - timedelta(days=d)
    # If the test date is a saturday (0 is monday, 6 sunday), output that date.
    if testdate.weekday() == 5:
        print testdate.strftime(fmt)

Test:

$ python test.py 20140605
20140531

Upvotes: 0

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