select date format in sql server

SELECT CONVERT(VARCHAR, GETDATE(), 100)                                            

SELECT CONVERT(VARCHAR, GETDATE(), 101)               

SELECT CONVERT(VARCHAR, GETDATE(), 102)        

SELECT CONVERT(VARCHAR, GETDATE(), 103)

SELECT CONVERT(VARCHAR, GETDATE(), 104)

SELECT CONVERT(VARCHAR, GETDATE(), 105)

SELECT CONVERT(VARCHAR, GETDATE(), 106)

SELECT CONVERT(VARCHAR, GETDATE(), 107)

SELECT CONVERT(VARCHAR, GETDATE(), 108)

SELECT CONVERT(VARCHAR, GETDATE(), 109)                                      

SELECT CONVERT(VARCHAR, GETDATE(), 110)

SELECT CONVERT(VARCHAR, GETDATE(), 111)

SELECT CONVERT(VARCHAR, GETDATE(), 112)

SELECT CONVERT(VARCHAR, GETDATE(), 113)                                          

SELECT CONVERT(VARCHAR, GETDATE(), 114)

SELECT CONVERT(VARCHAR, GETDATE(), 120)

SELECT CONVERT(VARCHAR, GETDATE(), 121)

SELECT CONVERT(VARCHAR, GETDATE(), 126)

For Example.

SELECT COUNT(*) AS CUST, SUBSTRING(CONVERT(VARCHAR(10), CREATEDDATE, 106), 0,7) AS DATE FROM COMPANY 

         WHERE CONVERT(DATE,CREATEDDATE) >= CONVERT(DATE,DATEADD(DAY, -30, GETDATE()))

         GROUP BY CONVERT(DATE,CreatedDate)