![]() ![]() Showing the effects of the SET DATEFORMAT and SET LANGUAGE settings on return values The following example shows you how to use ISDATE to test whether a character string is a valid datetime. ![]() Using ISDATE to test for a valid datetime expression ISDATE will return 0 if the expression is a datetime2 value, but will return 1 if the expression is a valid datetime value.Īny value that mixes a valid date with an invalid value, for example a.Įxamples A. Values of text, ntext, or image data types.Īny value that has a seconds precision scale greater than 3, (.0000 through. Values of data types listed in Data Types in any data type category other than character strings, Unicode character strings, or date and time. The following table summarizes input expression formats that are not valid and that return 0 or an error. For additional examples, also see the Input/Output column of the "Arguments" section of CAST and CONVERT. ISDATE expression Formatsįor examples of valid formats for which ISDATE will return 1, see the section "Supported String Literal Formats for datetime" in the datetime and smalldatetime topics. The return value of ISDATE depends on the settings set by SET DATEFORMAT, SET LANGUAGE and Configure the default language Server Configuration Option. ISDATE is deterministic only if you use it with the CONVERT function, if the CONVERT style parameter is specified, and style is not equal to 0, 100, 9, or 109. ![]() Date and time data types, except datetime and smalldatetime, are not allowed as the argument for ISDATE. The expression must be less than 4,000 characters. Is a character string or expression that can be converted to a character string. To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation. ![]()
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