Simple SQL Date Formula

I have searched for literally five hours and cannot find such a simple thing.
I am creating an SQL database and want to put in a column formula for both a date and a time field (both defined datetime).
I need one to be the date in yyyy/mm/dd format and one to be mm/dd/yyyy hh/mm format.
I've tried putting in the above (I know that minutes are nn) "yyyy/mm/dd" & "mm/dd/yyyy hh/nn"  respectively but it gives the error "Error validating the formula for column 'TDate'".
I feel like this is the most ridiculous qustion I've ever asked.
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Brian CroweDatabase AdministratorCommented:
The reason you can't find it is because it doesn't exist.  You are confusing format with data.  The database stores the data... you can pull it into a format if you like but the best way to do this is in an application not in the DB.  SQL does not have a date-only or a time-only datatype.  A datetime is stored as 2 4-byte integer values with one representing the number of days since 1/1/1900 and the other representing the number of milliseconds (more or less) since midnight.  If you give a more detailed example of what you are trying to accomplish then I can get more precise.
dcassAuthor Commented:
I know SQL doesn't have a date-only or time-only datatype, but you can put it in different formats by setiing the column format, can't you?  It doesn't have to be in mm/dd/yyyy - I know you can change it in the code, I was just looking for an automatic switch from mm/dd/yyyy to yyyy/mm/dd and thought I could use column format.
dcassAuthor Commented:
If you can't do it that way, how do you switch the date in C# from mm/dd/yyyy to yyyy/mm/dd?
Should I store the first field that I want just the date in as a varchar?  How do I strip off the time?
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Brian CroweDatabase AdministratorCommented:
It's stored the same no matter how you put it in as long as it is a valid datetime.  If you want to display it in different formats then you can use the Convert function

SELECT Convert(varchar, TDate, 101) --for mm/dd/yyyy
            Convert(varchar, TDate, 111) --for yy/mm/dd

Check out Convert in BOL for different formats
Brian CroweDatabase AdministratorCommented:
I'm not sure about C# but in VB.Net i would do something like

myDate.tostring("mm/dd/yyyy") if myDate is a datetime or
CDate(myDateString).tostring("mm/dd/yyyy") if i'm dealing with a date in string form.
dcassAuthor Commented:
Also, I want to run a 24 hour clock and not use am/pm.  Is it possible to store it that way so it sorts correctly?
Brian CroweDatabase AdministratorCommented:
You're still confusing storage value and format.  I'm sure that in C# you can create a custom format just like you can in VB.Net to apply to the control where you want to format the value.

dim strFormat1 as string = "yyyy/mm/dd HH:mm"
dim strFormat2 as string = "mm/dd/yyyy"

textbox1.text = CDate(myDatatable.rows(0).item("TDate")).tostring(strFormat1)

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