将varchar格式化为日期时间SQL Server 2008

Question

I have a table in which one of the columns is varchar but stores datetime.

Instead of saving date as varchar I am creating a new column. To copy existing date I use

SELECT CONVERT(Datetime,entryTime,101)

The original date is '7/13/2015 2:40:44 AM'

After using convert function I get

'2015-07-13 02:40:44.000'

What should I use to format it, to look like the original?

Answer 1

instead of using cast, use convert like you tried but if the date format is wrong then try using a different region.

I use this excellent post on date/times, have a read and it should help.

Answer 2

Try this,

DECLARE @Date AS DATETIME='7/13/2015 2:40:44 AM' --Original Date
DECLARE @UpdateDate AS DATETIME=''
SELECT @UpdateDate = CONVERT(DATETIME ,@Date ,101)  --Converted Date
--SELECT @UpdateDate 
SELECT CONVERT(VARCHAR(10) ,@UpdateDate ,101) +' '+CONVERT(VARCHAR(8) ,@UpdateDate ,108) ExpectedDate --As per your expected result.

With AM/PM try below,

SELECT CONVERT(VARCHAR(10) ,@UpdateDate ,101)+' '+CONVERT(VARCHAR(8) ,@UpdateDate ,108) 
      +' '+RIGHT(CONVERT(VARCHAR(30) ,@UpdateDate ,9) ,2) ExpectedDate --As per your expected result with AM/PM