How to Convert DateTime to VarChar with Specific Formatting in SQL Server?

Specific format conversion from datetime to VarChar in SQL Server

It is often necessary to convert a value stored as a DateTime variable into a VarChar variable formatted in a specific format (such as "yyyy-mm-dd"). This conversion is particularly useful for displaying or storing dates in a consistent and easy-to-read format.

Using the CONVERT() function along with one of the supported style options, you can achieve your desired formatting. Here’s how:

SELECT CONVERT(nvarchar(MAX), @date_value, <style_code>) AS formatted_date;

In this syntax:

• @date_value is the DateTime value you want to convert.
• <style_code> are style codes specifying the desired output format.

The following table lists the available style codes and their corresponding formats.

样式代码	输出格式
0	"dd mmm yyyy hh:mm:ss tt"
1	"dd/mm/yy"
2	"yy.mm.dd"
3	"dd/mm/yyyy"
4	"dd.mm.yyyy"
5	"dd-mm-yyyy"
6	"dd Mon yy"
7	"Mon dd, yy"
8	"hh:mm:ss tt"
9	"dd mmm yyyy hh:mm:ss tt (nnnn)"
10	"dd-mm-yyyy hh:mm:ss"
11	"yyyy-mm-dd hh:mm:ss"
12	"yyyymmdd"
13	"dd Mon yyyy hh:mm:ss tt"
14	"hh:mm:ss"
20	"yyyy-mm-dd hh:mm:ss.fff"
21	"yyyy-mm-dd hh:mm:ss.fffffff"
22	"dd/mm/yyyy hh:mm:ss AM/PM"
23	"yyyy-mm-dd"
24	"hh:mm"
25	"yyyy-mm-dd hh:mm:ss.fffffff"
100	"dd mmm yyyy hh:mm:ss tt (nnnn) TZ"
101	"dd/mm/yyyy hh:mm:ss (z)"
102	"yy.mm.dd hh:mm:ss (z)"
103	"dd/mm/yyyy hh:mm:ss"
104	"dd.mm.yyyy hh:mm:ss"
105	"dd-mm-yyyy hh:mm:ss"
106	"dd Mon yy hh:mm:ss (z)"
107	"Mon dd, yy hh:mm:ss (z)"
108	"hh:mm:ss (z)"
109	"dd mmm yyyy hh:mm:ss tt (nnnn) TZ"
110	"dd-mm-yyyy hh:mm:ss (z)"
111	"yyyy-mm-dd hh:mm:ss (z)"
112	"yyyymmdd hh:mm:ss"
113	"dd Mon yyyy hh:mm:ss tt (z)"
114	"hh:mm:ss (z)"
120	"yyyy-mm-dd hh:mm:ss.fff (z)"
121	"yyyy-mm-dd hh:mm:ss.fffffff (z)"
126	"yyyy-mm-ddTHH:mm:ss.fffffffZ"
127	"yyyy-mm-ddTHH:mm:ss.fffffff"
130	"dd جمادى الثانية mm hh:mm:ss.fffffff"
131	"dd/mm/yyyy hh:mm:ss AM/PM (z)"

To convert a DateTime value to a VarChar value in the format "yyyy-mm-dd", you can use the following method:

SELECT CONVERT(nvarchar(MAX), @date_value, <style_code>) AS formatted_date;

Note that the output VarChar value will have the format specified, but it will still represent a point in time with date and time components. If you just want to get the date part without the time, you can use the following technique:

SELECT CONVERT(nvarchar(MAX), @date_value, 23) AS formatted_date;

This will truncate the time component and return only the VarChar value with "yyyy-mm-dd" format.

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