The best methodĭon’t format dates: you don’t need to and you don’t have to. SQL Server offers different possibilities to accomplish the task: in this article I will try to discuss and compare some of them and hopefully, help you decide which one best suits your needs. While I heartedly agree with those answers, I must admit that I had to deal with some cases where the conversion had to be performed in the database and I will probably need that again someday. The canned answers people usually get are along the lines of “Don’t format dates in T-SQL” and “Don’t store dates in character columns”, with slight variations. Or, even more often: “How do I parse a date from this character column?”. In this tutorial, you have learned how to convert a string to a datetime using the CONVERT() and TRY_CONVERT() functions.One of the questions I see asked over and over on the forums is “How do I format this datetime column with this particular format string?”. The CONVERT() and TRY_CONVERT() functions can convert United States datetime format (month, day, year and time) by default, therefore, you don’t need to specify style 101: SELECT TRY_CONVERT( DATETIME, '12-31-2019') Note that the CONVERT() function can also convert an ISO date string without delimiters to a date value as shown in the following example: SELECT CONVERT(DATETIME, '20190731') result This example shows how to use the CONVERT() function to convert strings in ISO date format to datetime values: SELECT CONVERT(DATETIME, '') The TRY_CONVERT() function, on the other hand, returns NULL instead of raising an error if the conversion fails: SELECT TRY_CONVERT(DATETIME, '', 102) result Ĭode language: SQL (Structured Query Language) ( sql ) Converting a string in ANSI/ISO and US date format to a datetimeīoth CONVERT() and TRY_CONVERT() function can recognize ANSI/ISO and US formats with various delimiters by default so you don’t have to add the style parameter. The following is the error message: The conversion of a varchar data type to a datetime data type resulted in an out-of-range value. If the conversion fails, the CONVERT() function will raise an error: SELECT CONVERT(DATETIME, '', 102) result This example uses the CONVERT() function to convert a string in ANSI date format to a datetime: SELECT CONVERT(DATETIME, '', 102) result The main difference between CONVERT() and TRY_CONVERT() is that in case of conversion fails, the CONVERT() function raises an error while the TRY_CONVERT() function returns NULL. SQL Server provides the CONVERT() function that converts a value of one type to another: CONVERT(target_type, expression )Ĭode language: SQL (Structured Query Language) ( sql )īesides the CONVERT() function, you can also use the TRY_CONVERT() function: TRY_CONVERT(target_type, expression ) Introduction to CONVERT() and TRY_CONVERT() functions Summary: in this tutorial, you will learn how to convert a string to a datetime in SQL Server using the CONVERT() and TRY_CONVERT() function.
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