In SQL Server, you can use either Date or DateTime data type to store dates. It is the YYYY-MM-DD format for dates in SQL Server databases. Thus, the date June 06, 2021, will be stored as. Finally, the day of the month is presented in 2 digits, such as 20. The month is specified next in 2 digits ranging from 1-12 – e.g., June would be 06. The SQL Server YYYY-MM-DD data format suggests that the year is marked by four digits e.g., 2021. Let’s start! YYYY-MM-DD – the Date Format in SQL Server The current article will focus on storing dates in an SQL Server database table and converting different types of dates into the SQL Server format YYYY-MM-DD and vice versa. However, storing and handling such data have their specificities. One way to avoid this error in all languages is specify the date as an NVARCHAR string in full ISO 8601 format.An SQL Server database can store a variety of data types, such as numbers, text strings, Boolean values, dates, etc. Thursday, Ma9:27:44 AM - Andrew Schickedanz What Unicode characters are you expecting to protect? Thanks Andrew, I talk about the format you _should_ use in this quick video:īut I don't know that there is any reason to use nvarchar in this scenario. It tells me he's going to make some other local dialect mistakes. When reviewing code in my consulting work, this is one of the tells, they look for so I can spot an inexperienced SQL programmer. Another reason we picked it is that it is the most common, embedded display format among all the national options. This is why Microsoft defaults to this format in its current implementations and will eventually get rid of the old local dialects. We did this very deliberately to make dates uniform and easy to parse because it's not ambiguous. The only format permitted in the ANSI/ISO standards is the 8601 version with dashes. Maybe that's because they had to vote on them so many years ago when I was on the committee. There are times I think I'm the only person that reads the ANSI standards. Here are the ODBC scalar functions that are documented and supported: 'yyyyMMdd'ĭavide, that form is not even documented (so not sure if it is even officially supported), and it is not self-documenting, either. In any case, I wonder why is "easier" than just removing the dashes and using a string literal that is more universally supported? e.g. That I couldn't find them shows that it is not very discoverable (or I'm very bad at searching). SQL Server Date and Time Data Type Comparison SQL Server Date Time Shorthand and Other Tricks If you allow end users to type a date into a text field, you have zero confidenceįor more info on date handling in SQL Server, see these tips and videos: So that you can have full control over the format that is passed to SQL Server. If you are accepting user input from a form, please use a calendar or date picker, Incorrect data – until the first error happens on January 13 th. That you may not notice this issue until you misinterpret a date that actually breaks.įor example, if you start testing on January 1 stĪnd use today’s date as the literal, you might just not notice you are storing Make sure you are properly handling date formats and not making any assumptionsĪbout the user’s or application’s language or dateformat settings. Or any reason to believe any human being would Not quite sure, though it dates back to the Sybase and maybe even Ashton-Tate days.įor a more complete list of date formats organized by country, see these resources:Īnd you’ll note that those lists, too, do not contain a single instance Had an authoritative answer for you, or even a plausible guess. The next thing you might ask is why does SQL Server behave this way? I wish I
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