IT returns copy of financial year 2014-15 means, ? please mention from where to where (month and year)

IT IS FROM 01.04.2014 TO 31.03.2015.

Your query is not clear. Is it that you have submitted IT returns for a particular year and you want copy of it from the IT department?  The Income Tax Department goes on the bais of assessment year. For instance the income tax returns for the financial year 2014-15 will be submitted in the year 2015-16 and it is called ITR for the Assessment Year 2015-16. The financial year is referred as the 'Previous Year'.