SQL将日期时间转换为varchar

Question

I want to convert DATETIME to VARCHAR (month/day/year) like this:

10/09/2018 12:00:00.000

I tried using

Convert(VARCHAR(MAX),[Date & Time Added]),121)

but it returns

yyyy-mm-dd hh:mi:ss.mmm

I need the / format with time, I am Using SQL Server 2012.

Answer 1

You can use the FORMAT function:

SELECT FORMAT(GETDATE(), 'MM/dd/yyyy HH:mm:ss.fff')
-- 10/09/2018 00:58:52.557

Complete list of format specifiers is actually available in the .NET documentation .

---

If FORMAT function is unavailable you could simply format in a known format and use string functions to re-arrange the year, month, day and time parts. For example:

SELECT SUBSTRING(DateStr, 6, 2) + '/' + SUBSTRING(DateStr, 9, 2) + '/' + SUBSTRING(DateStr, 1, 4) + ' ' + SUBSTRING(DateStr, 12, 12)
FROM (
    SELECT CONVERT(VARCHAR(23), GETDATE(), 126) -- ISO8601 / yyyy-mm-ddThh:mi:ss.mmm
) AS CA(DateStr)
-- 10/09/2018 01:12:50.833

SELECT CONVERT(VARCHAR(10), Date, 101) + ' ' + CONVERT(VARCHAR(12), Date, 114)
FROM (
    SELECT GETDATE()
) AS CA(Date)
-- 10/09/2018 01:19:38:463

Answer 2

This is something that would usually be done in the presentation layer, but if you need to do it in the data layer you can use FORMAT ( documentation here )

Syntax is: FORMAT ( value, format [, culture ] )

So in your case (edited to add AM/PM designation per your comments) : FORMAT([Date & Time Added], 'dd/MM/yyy hh:mm:ss.fff tt')

Custom date format string options are detailed here