import datetime
import os

#crontab -e
#0 12 * * * /usr/bin/python /path/to/file.py > /path/to/log.txt

with open('/path/to/file.txt', 'a') as file:
    file.write(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")+"\n")

print "run ssh"
os.system('cd /path/to/ ; eval `ssh-agent -s`; ssh-add /home/USER/.ssh/github ; git add -A; git commit -m "'+datetime.datetime.now().strftime("%Y-%m-%d %
H:%M:%S")+'" ; git push -u origin master')