Shell Programming and Scripting

from time import strptime, strftime

date_in = '10/16/2013'

date_out = strftime('%Y-%m-%d', strptime(date_in, '%m/%d/%Y'))

print date_out

#!/usr/bin/env python
from time import strptime, strftime
import re
import sys

while 1 :
        line = sys.stdin.readline().strip()
        if not line : break
        while 1 :
            match = re.match(".*(\d{2}/\d{2}/\d{4}).*", line)
            if not match : break
            line = line.replace(match.groups()[0], strftime('%Y-%m-%d', strptime(match.groups()[0], '%m/%d/%Y')))
        print line