Unixtime quick usage - Seconds to date

1.1 Get unixtime in the console

$ date +%s

1.2 Get unixtime in python

>>> import time
>>> int(time.time())

2 Unixtime to date in the console

$ date -d "UTC 1970-01-01 1294779314 secs"

or

$ date -ud @1294779314

Resources
http://en.wikipedia.org/wiki/Date_(Unix)
http://www.linuxhowtos.org/Tips%20and%20Tricks/converting_unixtimestamp.htm