DECLARE @now datetime
SET @now = GETDATE()
	
select convert(nvarchar(MAX), @now, 0) as output, 0 as style 
union select convert(nvarchar(MAX), @now, 1), 1
union select convert(nvarchar(MAX), @now, 2), 2
union select convert(nvarchar(MAX), @now, 3), 3
union select convert(nvarchar(MAX), @now, 4), 4
union select convert(nvarchar(MAX), @now, 5), 5
union select convert(nvarchar(MAX), @now, 6), 6
union select convert(nvarchar(MAX), @now, 7), 7
union select convert(nvarchar(MAX), @now, 8), 8
union select convert(nvarchar(MAX), @now, 9), 9
union select convert(nvarchar(MAX), @now, 10), 10
union select convert(nvarchar(MAX), @now, 11), 11
union select convert(nvarchar(MAX), @now, 12), 12
union select convert(nvarchar(MAX), @now, 13), 13
union select convert(nvarchar(MAX), @now, 14), 14
--15 to 19 not valid
union select convert(nvarchar(MAX), @now, 20), 20
union select convert(nvarchar(MAX), @now, 21), 21
union select convert(nvarchar(MAX), @now, 22), 22
union select convert(nvarchar(MAX), @now, 23), 23
union select convert(nvarchar(MAX), @now, 24), 24
union select convert(nvarchar(MAX), @now, 25), 25
--26 to 99 not valid
union select convert(nvarchar(MAX), @now, 100), 100
union select convert(nvarchar(MAX), @now, 101), 101
union select convert(nvarchar(MAX), @now, 102), 102
union select convert(nvarchar(MAX), @now, 103), 103
union select convert(nvarchar(MAX), @now, 104), 104
union select convert(nvarchar(MAX), @now, 105), 105
union select convert(nvarchar(MAX), @now, 106), 106
union select convert(nvarchar(MAX), @now, 107), 107
union select convert(nvarchar(MAX), @now, 108), 108
union select convert(nvarchar(MAX), @now, 109), 109
union select convert(nvarchar(MAX), @now, 110), 110
union select convert(nvarchar(MAX), @now, 111), 111
union select convert(nvarchar(MAX), @now, 112), 112
union select convert(nvarchar(MAX), @now, 113), 113
union select convert(nvarchar(MAX), @now, 114), 114
union select convert(nvarchar(MAX), @now, 120), 120
union select convert(nvarchar(MAX), @now, 121), 121
--122 to 125 not valid
union select convert(nvarchar(MAX), @now, 126), 126
union select convert(nvarchar(MAX), @now, 127), 127
--128, 129 not valid
union select convert(nvarchar(MAX), @now, 130), 130
union select convert(nvarchar(MAX), @now, 131), 131
--132 not valid
order BY style
	
	
/*
 Result:
	output                   style
	Apr 28 2014  9:31AM          0
	04/28/14                     1
	14.04.28                     2
	28/04/14                     3
	28.04.14                     4
	28-04-14                     5
	28 Apr 14                    6
	Apr 28, 14                   7
	09:31:28                     8
	Apr 28 2014  9:31:28:580AM   9
	04-28-14                     10
	14/04/28                     11
	140428                       12
	28 Apr 2014 09:31:28:580     13
	09:31:28:580                 14
	2014-04-28 09:31:28          20
	2014-04-28 09:31:28.580      21
	04/28/14  9:31:28 AM         22
	2014-04-28                   23
	09:31:28                     24
	2014-04-28 09:31:28.580      25
	Apr 28 2014  9:31AM          100
	04/28/2014                   101
	2014.04.28                   102
	28/04/2014                   103
	28.04.2014                   104
	28-04-2014                   105
	28 Apr 2014                  106
	Apr 28, 2014                 107
	09:31:28                     108
	Apr 28 2014  9:31:28:580AM   109
	04-28-2014                   110
	2014/04/28                   111
	20140428                     112
	28 Apr 2014 09:31:28:580     113
	09:31:28:580                 114
	2014-04-28 09:31:28          120
	2014-04-28 09:31:28.580      121
	2014-04-28T09:31:28.580      126
	2014-04-28T09:31:28.580      127
	28 جمادى الثانية 1435  9:31:28:580AM    130
	28/06/1435  9:31:28:580AM    131
*/