That really isn't easy: You shouldn't store dates in string fields, because it makes this problem difficult.
SQL Dates are always yyyy-MM-dd, not dd/MM/yyyy so you can't even convert these to a date type first, without using multiple SUBSTRING functions and a lot of luck.
Seriously: change your database. Store your dates in Date fields, and you can manipulate them either inside the database or outside a lot more easily, and a lot more flexibly: for example, you do not then have to concern yourself about the users locale and his date format!"Sir,
Can You Give A Sample Query For Above Table So That I May Proceed I tried Many Ways But Am Not Getting"
It's not complex: try this to give you a clue:
SELECT CAST((SUBSTRING(Date, 7, 4) + '-' + SUBSTRING(Date, 4, 2) + '-' + SUBSTRING(Date, 1, 2)) AS Date) AS d FROM myTable
Seriously: Save yourself a LOT of future trouble by converting your database to Date or DateTime instead!