• After some digging I found one I had done quite time ago. In my opinion, it has a little nicer output. Also, I didn't realize about the every 400 years skipping leap year, but mine actually handled that just fine.

    Enjoy!

    Here's the code:

    DECLARE@thisyear varchar(4),@cnt int,@datestr varchar(12)

    SET@thisyear = '2100'

    SETnocount on

    IFEXISTS(SELECT * FROM tempdb.dbo.sysobjects WHERE xtype = 'U' and left(name,len('#calendar')) = '#calendar') drop table #calendar

    CREATETABLE #calendar (cid int identity(0,1),col1 varchar(4),col2 varchar(4),col3 varchar(4),col4 varchar(4),col5 varchar(4),col6 varchar(4),col7 varchar(4),col8 varchar(4),col9 varchar(4),col10 varchar(4),col11 varchar(4),col12 varchar(4),col13 varchar(4),col14 varchar(4),col15 varchar(4),col16 varchar(4),col17 varchar(4),col18 varchar(4),col19 varchar(4),col20 varchar(4),col21 varchar(4),col22 varchar(4),col23 varchar(4))

    INSERTINTO #calendar (col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23)

    VALUES('','','','','','','','','','','',@thisyear,'','','','','','','','','','','')

    SELECT@cnt = 1

    WHILE@cnt < 12

    BEGIN

    INSERTINTO #calendar (col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23)

    SELECT'','','',convert(varchar(3),(cast((cast(@cnt as varchar(2)) + '/01/' + @thisyear) as datetime)),100),'','','','','','','',convert(varchar(3),(cast((cast(@cnt+1 as varchar(2)) + '/01/' + @thisyear) as datetime)),100),'','','','','','','',convert(varchar(3),(cast((cast(@cnt+2 as varchar(2)) + '/01/' + @thisyear) as datetime)),100),'','',''

    INSERTINTO #calendar (col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23)

    VALUES('Sun','Mon','Tue','Wed','Thu','Fri','Sat','' ,'Sun','Mon','Tue','Wed','Thu','Fri','Sat','','Sun','Mon','Tue','Wed','Thu','Fri','Sat')

    INSERTINTO #calendar (col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23)

    SELECTcase datepart(dw,(cast(cast(@cnt as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '1' else '' END as 'Col1'

    ,case datepart(dw,(cast(cast(@cnt as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '2' when 2 then '1' else '' END as 'Col2'

    ,case datepart(dw,(cast(cast(@cnt as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '3' when 2 then '2' when 3 then '1' else '' END as 'Col3'

    ,case datepart(dw,(cast(cast(@cnt as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '4' when 2 then '3' when 3 then '2' when 4 then '1' else '' END as 'Col4'

    ,case datepart(dw,(cast(cast(@cnt as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '5' when 2 then '4' when 3 then '3' when 4 then '2' when 5 then '1' else '' END as 'Col5'

    ,case datepart(dw,(cast(cast(@cnt as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '6' when 2 then '5' when 3 then '4' when 4 then '3' when 5 then '2' when 6 then '1' else '' END as 'Col6'

    ,case datepart(dw,(cast(cast(@cnt as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '7' when 2 then '6' when 3 then '5' when 4 then '4' when 5 then '3' when 6 then '2' when 7 then '1' else '' END as 'Col7'

    ,'' as 'Col8'

    ,case datepart(dw,(cast(cast(@cnt+1 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '1' else '' END as 'Col9'

    ,case datepart(dw,(cast(cast(@cnt+1 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '2' when 2 then '1' else '' END as 'Col10'

    ,case datepart(dw,(cast(cast(@cnt+1 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '3' when 2 then '2' when 3 then '1' else '' END as 'Col11'

    ,case datepart(dw,(cast(cast(@cnt+1 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '4' when 2 then '3' when 3 then '2' when 4 then '1' else '' END as 'Col12'

    ,case datepart(dw,(cast(cast(@cnt+1 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '5' when 2 then '4' when 3 then '3' when 4 then '2' when 5 then '1' else '' END as 'Col13'

    ,case datepart(dw,(cast(cast(@cnt+1 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '6' when 2 then '5' when 3 then '4' when 4 then '3' when 5 then '2' when 6 then '1' else '' END as 'Col14'

    ,case datepart(dw,(cast(cast(@cnt+1 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '7' when 2 then '6' when 3 then '5' when 4 then '4' when 5 then '3' when 6 then '2' when 7 then '1' else '' END as 'Col15'

    ,'' as 'Col16'

    ,case datepart(dw,(cast(cast(@cnt+2 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '1' else '' END as 'Col17'

    ,case datepart(dw,(cast(cast(@cnt+2 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '2' when 2 then '1' else '' END as 'Col18'

    ,case datepart(dw,(cast(cast(@cnt+2 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '3' when 2 then '2' when 3 then '1' else '' END as 'Col19'

    ,case datepart(dw,(cast(cast(@cnt+2 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '4' when 2 then '3' when 3 then '2' when 4 then '1' else '' END as 'Col20'

    ,case datepart(dw,(cast(cast(@cnt+2 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '5' when 2 then '4' when 3 then '3' when 4 then '2' when 5 then '1' else '' END as 'Col21'

    ,case datepart(dw,(cast(cast(@cnt+2 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '6' when 2 then '5' when 3 then '4' when 4 then '3' when 5 then '2' when 6 then '1' else '' END as 'Col122'

    ,case datepart(dw,(cast(cast(@cnt+2 as varchar(2)) + '/01/' + @thisyear as datetime))) when 1 then '7' when 2 then '6' when 3 then '5' when 4 then '4' when 5 then '3' when 6 then '2' when 7 then '1' else '' END as 'Col123'

    INSERTINTO #calendar (col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23)

    SELECTcol7+1,col7+2,col7+3,col7+4,col7+5,col7+6,col7+7,'',col15+1,col15+2,col15+3,col15+4,col15+5,col15+6,col15+7,'',col23+1,col23+2,col23+3,col23+4,col23+5,col23+6,col23+7

    FROM#calendar

    WHEREcid = (SELECT max(cid) FROM #calendar)

    INSERTINTO #calendar (col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23)

    SELECTcol7+1,col7+2,col7+3,col7+4,col7+5,col7+6,col7+7,'',col15+1,col15+2,col15+3,col15+4,col15+5,col15+6,col15+7,'',col23+1,col23+2,col23+3,col23+4,col23+5,col23+6,col23+7

    FROM#calendar

    WHEREcid = (SELECT max(cid) FROM #calendar)

    INSERTINTO #calendar (col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23)

    SELECTcol7+1,col7+2,col7+3,col7+4,col7+5,col7+6,col7+7,'',col15+1,col15+2,col15+3,col15+4,col15+5,col15+6,col15+7,'',col23+1,col23+2,col23+3,col23+4,col23+5,col23+6,col23+7

    FROM#calendar

    WHEREcid = (SELECT max(cid) FROM #calendar)

    INSERTINTO #calendar (col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23)

    SELECTcase when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+1 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+1 as varchar(2)) END else '' END as col1

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+2 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+2 as varchar(2)) END else '' END as col2

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+3 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+3 as varchar(2)) END else '' END as col3

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+4 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+4 as varchar(2)) END else '' END as col4

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+5 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+5 as varchar(2)) END else '' END as col5

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+6 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+6 as varchar(2)) END else '' END as col6

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+7 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+7 as varchar(2)) END else '' END as col7

    ,'' as col8

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+1 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+1 as varchar(2)) END else '' END as col9

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+2 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+2 as varchar(2)) END else '' END as col10

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+3 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+3 as varchar(2)) END else '' END as col11

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+4 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+4 as varchar(2)) END else '' END as col12

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+5 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+5 as varchar(2)) END else '' END as col13

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+6 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+6 as varchar(2)) END else '' END as col14

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+7 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+7 as varchar(2)) END else '' END as col15

    ,'' as col16

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+1 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+1 as varchar(2)) END else '' END as col17

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+2 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+2 as varchar(2)) END else '' END as col18

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+3 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+3 as varchar(2)) END else '' END as col19

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+4 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+4 as varchar(2)) END else '' END as col20

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+5 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+5 as varchar(2)) END else '' END as col21

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+6 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+6 as varchar(2)) END else '' END as col22

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+7 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+7 as varchar(2)) END else '' END as col23

    FROM#calendar

    WHEREcid = (SELECT max(cid) FROM #calendar)

    INSERT INTO #calendar (col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23)

    SELECTcase when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+1 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+1 as varchar(2)) END else '' END as col1

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+2 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+2 as varchar(2)) END else '' END as col2

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+3 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+3 as varchar(2)) END else '' END as col3

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+4 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+4 as varchar(2)) END else '' END as col4

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+5 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+5 as varchar(2)) END else '' END as col5

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+6 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+6 as varchar(2)) END else '' END as col6

    ,case when col7 <> '' then case isdate((cast(@cnt as varchar(2)) + '/' + cast(col7+7 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col7+7 as varchar(2)) END else '' END as col7

    ,'' as col8

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+1 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+1 as varchar(2)) END else '' END as col9

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+2 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+2 as varchar(2)) END else '' END as col10

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+3 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+3 as varchar(2)) END else '' END as col11

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+4 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+4 as varchar(2)) END else '' END as col12

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+5 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+5 as varchar(2)) END else '' END as col13

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+6 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+6 as varchar(2)) END else '' END as col14

    ,case when col15 <> '' then case isdate((cast(@cnt+1 as varchar(2)) + '/' + cast(col15+7 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col15+7 as varchar(2)) END else '' END as col15

    ,'' as col16

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+1 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+1 as varchar(2)) END else '' END as col17

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+2 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+2 as varchar(2)) END else '' END as col18

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+3 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+3 as varchar(2)) END else '' END as col19

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+4 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+4 as varchar(2)) END else '' END as col20

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+5 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+5 as varchar(2)) END else '' END as col21

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+6 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+6 as varchar(2)) END else '' END as col22

    ,case when col23 <> '' then case isdate((cast(@cnt+2 as varchar(2)) + '/' + cast(col23+7 as varchar(2)) + '/' + @thisyear)) when 0 then '' else cast(col23+7 as varchar(2)) END else '' END as col23

    FROM#calendar

    WHEREcid = (SELECT max(cid) FROM #calendar)

    INSERTINTO #calendar (col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23)

    VALUES('','','','','','','','','','','','','','','','','','','','','','','')

    SET@cnt = @cnt + 3

    END

    SELECTcol1 as ' ',col2 as ' ',col3 as ' ',col4 as ' ',col5 as ' ',col6 as ' ',col7 as ' ',col8 as ' ',col9 as ' ',col10 as ' ',col11 as ' ',col12 as ' ',col13 as ' ',col14 as ' ',col15 as ' ',col16 as ' ',col17 as ' ',col18 as ' ',col19 as ' ',col20 as ' ',col21 as ' ',col22 as ' ',col23 as ' '

    FROM#calendar

    IFEXISTS(SELECT * FROM tempdb.dbo.sysobjects WHERE xtype = 'U' and left(name,len('#calendar')) = '#calendar') drop table #calendar