- current_time = Time.now # => 2012-08-24
- current_time + 2.year # => 2014-08-24
- current_time - 5.month # => 2012-03-24
- current_time + 7.day # => 2012-08-31
- current_time = Time.now # => 2012-08-24
- current_time + 2.year # => 2014-08-24
- current_time - 5.month # => 2012-03-24
- current_time + 7.day # => 2012-08-31