select convert(varchar, getdate(), 103);

    output: 30/12/2006 (dd/mm/yyyy)

-- Below more pattern: 

DATE ONLY FORMATS

select convert(varchar, getdate(), 1);

    output: 12/30/06 (mm/dd/yy)

select convert(varchar, getdate(), 2);  

    output: 06.12.30 (yy.mm.dd)

select convert(varchar, getdate(), 3);  

    output: 30/12/06 (dd/mm/yy)

select convert(varchar, getdate(), 4);  

    output: 30.12.06 (dd.mm.yy) 

select convert(varchar, getdate(), 5);

    output: 30-12-06 (dd-mm-yy)

select convert(varchar, getdate(), 6);  

    output: 30 Dec 06 (dd-Mon-yy)

select convert(varchar, getdate(), 7);  

    output: Dec 30, 06 (Mon dd, yy)

select convert(varchar, getdate(), 10); 

    output: 12-30-06 (mm-dd-yy)

select convert(varchar, getdate(), 11);

    output: 06/12/30 (yy/mm/dd)

select convert(varchar, getdate(), 12); 

    output: 061230 (yymmdd)

select convert(varchar, getdate(), 23);

    output: 2006-12-30 (yyyy-mm-dd)

select convert(varchar, getdate(), 101);

    output: 12/30/2006 (mm/dd/yyyy)

select convert(varchar, getdate(), 102);

    output: 2006.12.30 (yyyy.mm.dd)

select convert(varchar, getdate(), 103);

    output: 30/12/2006 (dd/mm/yyyy)

select convert(varchar, getdate(), 104);

    output: 30.12.2006 (dd.mm.yyyy)

select convert(varchar, getdate(), 105);

    output: 30-12-2006 (dd-mm-yyyy)

select convert(varchar, getdate(), 106);

    output: 30 Dec 2006 (dd Mon yyyy)

select convert(varchar, getdate(), 107);

    output: Dec 30, 2006 (Mon dd, yyyy)

select convert(varchar, getdate(), 110);    

    output: 12-30-2006 (mm-dd-yyyy)

select convert(varchar, getdate(), 111);    

    output: 2006/12/30 (yyyy/mm/dd)

select convert(varchar, getdate(), 112);

    output : 20061230 (yyyymmdd)

TIME ONLY FORMATS

select convert(varchar, getdate(), 8);

    output: 00:38:54 (hh:mm:ss)

select convert(varchar, getdate(), 14); 

    output: 00:38:54:840 (hh:mm:ss:nnn)

select convert(varchar, getdate(), 24); 

    output: 00:38:54 (hh:mm:ss)

select convert(varchar, getdate(), 108);

    output: 00:38:54 (hh:mm:ss)

select convert(varchar, getdate(), 114);

    output: 00:38:54:840 (hh:mm:ss:nnn)

DATE & TIME FORMATS

select convert(varchar, getdate(), 0);  

    output: Dec 30 2006 12:38AM (Mon dd yyyy hh:mm AM/PM)

select convert(varchar, getdate(), 9);

    output: Dec 30 2006 12:38:54:840AM (Mon dd yyyy hh:mm:ss:nnn AM/PM)

select convert(varchar, getdate(), 13);

    output: 30 Dec 2006 00:38:54:840AM (dd Mon yyyy hh:mm:ss:nnn AM/PM)

select convert(varchar, getdate(), 20); 

    output: 2006-12-30 00:38:54 (yyyy-mm-dd hh:mm:ss)

select convert(varchar, getdate(), 21); 

    output: 2006-12-30 00:38:54.840 (yyyy-mm-dd hh:mm:ss:nnn)

select convert(varchar, getdate(), 22); 

    output: 12/30/06 12:38:54 AM (mm/dd/yy hh:mm:ss AM/PM)

select convert(varchar, getdate(), 25);

    output: 2006-12-30 00:38:54.840 (yyyy-mm-dd hh:mm:ss:nnn)

select convert(varchar, getdate(), 100);

    output: Dec 30 2006 12:38AM (Mon dd yyyy hh:mm AM/PM)

select convert(varchar, getdate(), 109);    

    output: Dec 30 2006 12:38:54:840AM (Mon dd yyyy hh:mm:ss:nnn AM/PM)

select convert(varchar, getdate(), 113);

    output: 30 Dec 2006 00:38:54:840 (dd Mon yyyy hh:mm:ss:nnn)

select convert(varchar, getdate(), 120);

    output: 2006-12-30 00:38:54 (yyyy-mm-dd hh:mm:ss)

select convert(varchar, getdate(), 121);

    output: 2006-12-30 00:38:54.840 (yyyy-mm-dd hh:mm:ss:nnn)

select convert(varchar, getdate(), 126);

    output: 2006-12-30T00:38:54.840 (yyyy-mm-dd T hh:mm:ss:nnn)

select convert(varchar, getdate(), 127);    

    output: 2006-12-30T00:38:54.840 (yyyy-mm-dd T hh:mm:ss:nnn  )

ISLAMIC CALENDAR DATES

select convert(nvarchar, getdate(), 130);

select convert(nvarchar, getdate(), 131);   

    output: 10/12/1427 12:38:54:840AM (dd mmm yyyy hh:mi:ss:nnn AM/PM)

​

select replace(convert(varchar, getdate(),101),'/','');

    output: 12302006 (mmddyyyy)

select replace(convert(varchar, getdate(),101),'/','') + replace(convert(varchar, getdate(),108),':','');   

    output: 12302006004426 (mmddyyyyhhmmss)