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Read nvarchar (mm/dd/yyyy) as Date in SQL Function

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Last Modified: 2012-05-05
I have a SQL query that I use to calculate someone's age from a date.  The query works fine on date fields, but now I need to apply it to a nvarchar field and it's having trouble reading the data as a date.  All the data is in mm/dd/yyyy format.  The relevant line from the query is included below.  Any help is appreciated, and if you have a cleaner way to calculate age, feel free to share it.  Thanks.
DATEDIFF(YY, Bday.PropertyValue, GETDATE()) - CASE WHEN (MONTH(Bday.PropertyValue) = MONTH(GETDATE()) AND DAY(Bday.PropertyValue) > DAY(GETDATE()) OR MONTH(Bday.PropertyValue) > MONTH(GETDATE())) THEN 1 ELSE 0 END AS 'Age'

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