epoch and date conversion in Linux command line

http://stackoverflow.com/questions/14805591/how-to-convert-strings-like-19-feb-12-to-epoch-date-in-unix

date --date="19-FEB-12" +%s

Current epoch:

date +%s

So, since your dates are in the past:

NOW=`date +%s`
THEN=`date --date="19-FEB-12" +%s`

let DIFF=$NOW-$THEN
echo "The difference is: $DIFF"

Convert epoch seconds to date

Convert seconds since the epoch (1970-01-01 UTC) to a date

$ date --date='@2147483647'

Details see $man date

qyang@ubuntu:~$ date +%w
6                                                           0 is SUN, 6 is SAT
qyang@ubuntu:~$ date --date='2-JAN-2017' +%w
1                                                           1 is MON
qyang@ubuntu:~$ date --date='2-JAN-2017' +%s
1483275600

qyang@ubuntu:~$ date --date='2-JAN-2017' +%s

1483275600

qyang@ubuntu:~$ ipython

Python 2.7.12 (default, Nov 19 2016, 06:48:10) 

In [1]: 1483275600+60*24*60*60.

Out[1]: 1488459600.0

So, in 60 days from 2-Jan-2017 will be 3-Mar-2017:

qyang@ubuntu:~$ date --date='@1488459600.0'

Fri Mar  3 00:00:00 AEDT 2017

To calculate how many days between two dates:
qyang@ubuntu:~$ date --date='31-Dec-2016' +%s
1483102800
qyang@ubuntu:~$ date --date='6-Mar-2017' +%s
1488718800
qyang@ubuntu:~$ ipython
Python 2.7.12 (default, Nov 19 2016, 06:48:10)
Type "copyright", "credits" or "license" for more information.
In [1]: (1488718800 - 1483102800)/(24*60*60.)
Out[1]: 65.0

It's 65 days from 31-Dec-2016 to 6-Mar-2017.

Using Open DNS for Household Internet Monitoring

http://www.howtogeek.com/68886/how-to-configure-your-router-for-network-wide-url-logging/

https://www.opendns.com

BLOCK
c7.rbxcdn.com
facebook.com
game.weixin.qq.com
roblox.com
www.roblox.com
sumdog.com

pokemon.com
scratch.mit.edu

To block uTube:
youtube.com
googlevideo.com
youtube.l.google.com
ytimg.com
ytimg.l.google.com

NOT BLOCK
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play.google.com