![]() And, please, don't do like the rest of the people have about this and say that "performance sometimes doesn't matter" because it always matters and don't try to justify it to support "migratable" code because easily easily migratable code is a myth. The warning should be that it's a serious performance performance and it should never be used in T-SQL until they fix it. Good article but FORMAT has been out for quite a while and so have the tests that prove that it's usually about 43 times slower than even some of the strange combinations of multiple CONVERTs. Good thing there are usually multiple ways to do things in SQL Server. Hi Jeff, thanks for your input on performance with the FORMAT statement. Wednesday, Novem1:54:12 PM - Greg Robidoux Great solution for converting date to an integer " CONVERT(CHAR(8),112) as 'MyDate' " and this solution is efficient than converting date this way " FORMAT(, 'yyyyMMdd') as 'MyDate' " Wednesday, Janu4:56:06 PM - Zingisa Matwana In other words, DATETIME is not standard.Īlso, a tiny observation: if you ever create, say, a computed column that will use CAST for date-time conversion, when you script out the table, you will notice that the script will be created using CONVERT, not CAST.Īs a final note: 'YYYMMDD' and 'YYMMDD' are ISO standard, so they should be used for data retrieval. : Use the time, date, datetime2 and datetimeoffset data types for new work. How SQL Server handles the date format YYYY-MM-DD SQL Date Format examples using SQL FORMAT Function SQL Server Date and Time Functions with Examples More SQL Server Date Functions for different formats and calculationsĪdd and Subtract Dates using DATEADD in SQL Serverĭetermine SQL Server Date and Time Parts with DATEPART and DATENAME. ![]() Have used the yyyymmdd date format! Next Stepsĭate and Time Conversions Using SQL Server I have also seen the use of Char(6) YYYYMM Of the Year Month Day short format, might include concatenating a date to a file The flexibility that SQL Server has handling dates. I hope you enjoyed this exercise on year, month, day date formats and can see The different date delimiters and the ability to use different delimited dates as Results: Review the 3 result sets from the queries! Note Note using Year, month, day in the where clause that SQL server will recognize different delimiters: dash, slash, dot or no delimiter as shown above. SELECT FORMAT(,'yyyy-MM-dd') as 'MyDate_w_Dash',įORMAT(,'yyyy/MM/dd') as 'MyDate_w_Slash',įORMAT(,'yyyy.MM.dd') as 'MyDateTime_w_Dot' Alternative formats that returns Year Month Day mixing Date and Datetime formats using FORMAT: ![]() Alternative formats that returns Year Month Day mixing Date and Datetime formats using CONVERT:
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