Getting Yesterdays or Tomorrows day with shell date command

$ date --date='2 year ago' # past
$ date --date='3 years' # go into future
$ date --date='2 days' # future
$ date --date='1 month ago' # past
$ date --date='2 months' # future

Create functions to join and split strings in SQL

http://articles.techrepublic.com.com/5100-9592-5259821.html