SQL

sql server date format dd/mm/yyyy

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)

sql server date format yyyy-MM-ddThh:mm:ss

select REPLACE(convert(varchar, getdate() , 20), ' ', 'T')  

convert dd/mm/yyyy to yyyy-mm-dd in sql server

set dateformat dmy;
select PersonalDetails_DOB
    ,convert(nvarchar(10), cast(PersonalDetails_DOB as datetime), 102) as ANSI_DOB
    ,convert(nvarchar(10), cast(PersonalDetails_DOB as datetime), 120) as ODBC_DOB
from Users;