Question

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Create a date with T-SQL

I’ve a data table that stores each year, month and day value as ints:

year | month | day
2009 |   1   |  1 
2008 |  12   |  2
2007 |   5   |  5

I need to convert it to datetime value, because I need to use it in a datetime between operation. How could I do this?

Answer 1

In order to be independent of the language and locale settings, you should use the ISO 8601 YYYYMMDD format – this will work on any SQL Server system with any language and regional setting in effect:

SELECT
   CAST(
      CAST(year AS VARCHAR(4)) +
      RIGHT('0' + CAST(month AS VARCHAR(2)), 2) +
      RIGHT('0' + CAST(day AS VARCHAR(2)), 2) 
   AS DATETIME)