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Asked: 2026-05-15T06:16:32+00:00

I need to assign a formatted date to a column in a data flow.

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I need to assign a formatted date to a column in a data flow. I have added a Derived shape and entered the following expression for a NEW column – Derived Column = “add as new column”:

"BBD" + SUBSTRING((DT_WSTR,4)DATEADD("Day",30,GETDATE()),1,4) + 
SUBSTRING((DT_WSTR,2)DATEADD("Day",30,GETDATE()),6,2) + 
SUBSTRING((DT_WSTR,2)DATEADD("Day",30,GETDATE()),9,2)

The problem is that the Derived Column Transformation Editor automatically assigns a Data Type of Unicode string[DT_WSTR] and a length of “7”. Howver, the length of a string is 11, therefore the following exception is thrown each time:

[Best Before Date [112]] Error: The "component "Best Before Date" (112)" failed 
because truncation occurred, and the truncation row disposition on "output column
"Comments" (132)" specifies failure on truncation. A truncation error occurred 
on the specified object of the specified component.

Does anyone know why the edit is insisting on a length of 7? I don’t seem to be able to change this.

Many thanks,

Rob.

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1 Answer

  1. Editorial Team

    I can’t understand why SSIS is measuring that column as only resulting in a seven character field – but to force it to provide an 11 character column for it, modify your expression slightly to this:

    (DT_WSTR, 11)(“BBD” + SUBSTRING((DT_WSTR,4)DATEADD(“Day”,30,GETDATE()),1,4) + SUBSTRING((DT_WSTR,2)DATEADD(“Day”,30,GETDATE()),6,2) + SUBSTRING((DT_WSTR,2)DATEADD(“Day”,30,GETDATE()),9,2))

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