[Rails] logic problem in ruby on rails with data retrieve from MySQL

For my ruby in rails  application. i need to  display the report of last one year. so i decide to take the current date and subtract one then will get the last year. And then take the datas from the mysql with that new date..

is this correct logic?.... or can i  get value from the MySQL,  after done the one year subtracted operation in MySQL......? 

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