Convert Columns with Day1, Day2, Day3... Day31 converted to Dates

Create the new table first, with the second column being of DATETIME or SMALLDATETIME type.  Then do this in 31 separate queries:

insert into myNewTable
select WorkCenter, convert(varchar,[Century]) + convert(varchar,[Year]) +'-'+ convert(varchar,[month]) +'-01', Day1 as Available
from myCurrentTable

insert into myNewTable
select WorkCenter, convert(varchar,[Century]) + convert(varchar,[Year]) +'-'+ convert(varchar,[month]) +'-02', Day2 as Available
from myCurrentTable

insert into myNewTable
select WorkCenter, convert(varchar,[Century]) + convert(varchar,[Year]) +'-'+ convert(varchar,[month]) +'-03', Day3 as Available
from myCurrentTable

-- ... etc


insert into myNewTable
select WorkCenter, convert(varchar,[Century]) + convert(varchar,[Year]) +'-'+ convert(varchar,[month]) +'-31', Day31 as Available
from myCurrentTable

If you want this in a single SQL statement, then try to use UNPIVOT:

select WorkCentre
     , [Date] = convert(date, convert(char(8), Century * 1000000 + [Year] * 10000 + Month * 100 + convert(int, replace([Day], 'Day', ''))), 112)
	 , Available
from your_table
unpivot (
   Available for [Day] in (Day1, Day2, Day3, Day4, Day31)
) upvt
;

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One caveat to note is that your data needs to be clean to start with.  In other words, for April you should have NULL value for Day31 as there is not a 31st day of April.  UNPIVOT will handle the nulls correctly since you won't get a row for that in the result.

Note also, my solution is converting the date parts into a true date.  I tested on a SQL 2008 system, so went with DATE data type.  If you want the results displayed as MM/DD/YYYY, you can use CONVERT or instead of casting to a date, simply build each part of the string as above Expert showed.

Here is my query...
 select WorkCentre
     , [Date] = convert(date, convert(char(8), CapacityCentury * 1000000 + [CapacityYear] * 10000 + CapacityMonth * 100 + convert(int, replace([Day], 'Day', ''))), 112)
       , Available
from dbo.BomCapacity
unpivot (
    Available for [Day] in (CapacityAvail1,
CapacityAvail2,
CapacityAvail3,
CapacityAvail4,
CapacityAvail5,
CapacityAvail6,
CapacityAvail7,
CapacityAvail8,
CapacityAvail9,
CapacityAvail10,
CapacityAvail11,
CapacityAvail12,
CapacityAvail13,
CapacityAvail14,
CapacityAvail15,
CapacityAvail16,
CapacityAvail17,
CapacityAvail18,
CapacityAvail19,
CapacityAvail20,
CapacityAvail21,
CapacityAvail22,
CapacityAvail23,
CapacityAvail24,
CapacityAvail25,
CapacityAvail26,
CapacityAvail27,
CapacityAvail28,
CapacityAvail29,
CapacityAvail30,
CapacityAvail31)
) upvt
;


This is the message i get

Msg 245, Level 16, State 1, Line 1
Conversion failed when converting the nvarchar value 'CapacityAvail1' to data type int.

That is because your values aren't really Day1, Day2, ... Day31.  Therefore, replacing 'Day' doesn't work.  You will need to replace 'CapacityAvail'.  Remember the point there is to get the number isolated so you can convert to an integer.

select WorkCentre
     , [Date] = convert(date, convert(char(8), CapacityCentury * 1000000 + [CapacityYear] * 10000 + CapacityMonth * 100 + convert(int, replace([Day], 'CapacityAvail', ''))), 112)
       , Available
from dbo.BomCapacity
unpivot (
    Available for [Day] in (CapacityAvail1, 
    CapacityAvail2,
    CapacityAvail3,
    CapacityAvail4,
    CapacityAvail5,
    CapacityAvail6,
    CapacityAvail7,
    CapacityAvail8,
    CapacityAvail9,
    CapacityAvail10,
    CapacityAvail11,
    CapacityAvail12,
    CapacityAvail13,
    CapacityAvail14,
    CapacityAvail15,
    CapacityAvail16,
    CapacityAvail17,
    CapacityAvail18,
    CapacityAvail19,
    CapacityAvail20,
    CapacityAvail21,
    CapacityAvail22,
    CapacityAvail23,
    CapacityAvail24,
    CapacityAvail25,
    CapacityAvail26,
    CapacityAvail27,
    CapacityAvail28,
    CapacityAvail29,
    CapacityAvail30,
    CapacityAvail31)
) upvt
;

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mwvisa1,

I am still getting the error.. What I am I not doing correctly??..

Msg 241, Level 16, State 1, Line 1
Conversion failed when converting date and/or time from character string.

knightEknight,

This Table you showed me doesnt appear to be run everyday...Did I miss something?

mwvisa1,

Excellent Job!! Thank you very much...

You helped me tremendously..

Michael